SJ 20629-1997 General specification for maintenance shelter of double 35 fire control system
Some standard content:
Military Standard of the Electronic Industry of the People's Republic of China FL1285
SJ20629-97
General specification for maintenance shelter of doub 35 fire control system1997-06-17 Issued
1997-10-01 Implementation
Approved by the Ministry of Electronics Industry of the People's Republic of China 1 Scope
1.1 Subject matter
1.2 Scope of application
2. Reference documents
3 Requirements
3.1 Qualification
3.2 Design
3.3 Materials
Components and parts
Reliability
3.6 Maintainability
Functional characteristics
Performance characteristics
Safety
3.10 Electromagnetic compatibility...
3.11 Environmental adaptability.
3.12 Marking and symbol 3.13 Surface appearance and color
3.14 Appearance quality
4 Quality assurance regulations
4.1 Inspection responsibility
4.2 Inspection classification
4.3 Inspection conditions
4.4 Identification inspection
4.5 Quality consistency inspection
4. Packaging inspection
4.7 Inspection method·
S Delivery preparation.
5.1 Sealing and packaging
5.2 Transportation and storage...
5.3 Marking·
6 Notes·
6.1 Definition
6.2 Intended use
. (11)
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People's Republic of China Electronic Industry Military Standard General Specification for Maintenance Shelter of Double 35 Fire Control System1Scope
1.1Subject Content
SJ 20629-97
This specification specifies the requirements, quality assurance regulations and delivery preparation for the maintenance shelter system of the double 35 fire control system. 1.2Scope of Application
This specification applies to the design, production, inspection, packaging, transportation and storage of the field maintenance shelter system of the double 35 fire control system (hereinafter referred to as the shelter system).
2 Referenced Documents
GJB/2 27---92
GJB 74.2—85
GJB 74.5-85
GJB 74.6--85
GJB 74.9—85
GJB74.14—88
GJB 152--86
Handbook of Reliability Thermal Design of Electronic Equipment
General Technical Conditions for Military Ground Radars Terminology General Technical Conditions for Military Ground Radars Design and Manufacturing Requirements General Technical Conditions for Military Ground Radars Environmental Conditions Requirements and Test Methods General Technical Conditions for Military Ground Radars Acceptance Rules General Technical Conditions, Marking, Packaging, Transportation, Storage of Military Ground Radars Electromagnetic Emission and Sensitivity Measurements for Military Equipment and Subsystems GJB/Z299A-—91 Handbook of Reliability Prediction of Electronic Products GJB 368.2-87
GJB 437-88
GJB 438—88
GJB 439—88
GJB 870—90
GJB 1348 -92
GJB 1349—92
GJB 2093—94
GJB 20148—93
SJ 207.1—82
3 Requirements
General specification for equipment maintainability Basic requirements for maintainability Military software development specification
Military software manuscript preparation specification
Military software quality assurance specification
General specification for military electronic equipment shelters
Military shelter terminology
Military shelter codes and markings
General test methods for military shelters
Military ground radar Random file composition and item format Design file management system Classification and composition of design files Ministry of Electronics Industry of the People's Republic of China Issued on June 17, 1997 Implementation on October 1, 1997
3.1 Qualification appraisal
SJ20629-97
Products submitted in accordance with this specification shall be products that have passed the appraisal or have been approved for finalization. 3.2 Design
3.2.1 Dimensions
3.2.1.1 The dimensions of the shelter system shall comply with the provisions of Article 1.1 of GJB75.5. 3.2.1.2 Shelter dimensions
The overall dimensions are: length 5000mm;
width 2240mm;
height 1950mm (including sliding).
3.2.2 Weight and center of gravity
a. The total weight of the entire shelter under load should not exceed 5000kg; b. Under the loaded state, the longitudinal and transverse position deviation of the center of gravity of the entire lower compartment from the geometric center shall not exceed 5%, and the height of the center of gravity shall not exceed 800 mm
3.2.3 Standardization
Tools, standardization requirements shall comply with the provisions of Article 1.2 of GJB74.5b, standard parts shall be used to the maximum extent in the design: e, parts, components, complete parts or matching parts that are easy to damage and fail shall be interchangeable: a: The completeness of the design documents shall comply with the provisions of Article 6.3 of SJ207.1. 3.2.4 Reliability design
Reliability design shall comply with the provisions of Articles 1.3.1 and 3.4.3 of GJB74.5 and GJB/Z299A. 3.2.5 Maintainability design
Maintainability design shall comply with the provisions of Article 1.3.2 of GJB74.5 and Chapter 2 of GJB368.2. 3.2.6 Electromagnetic compatibility design
Electromagnetic compatibility design shall comply with the provisions of Article 1.8 of GJB74.5. 3.2.7 Thermal design
Thermal design shall comply with the provisions of Chapter 4 of GJB/Z27. 3.2.8 Safety design
Safety design shall comply with the provisions of Article 1.9 of GJB74.5 and Article 4.1.7 of GIB870. 3.2.9 Software design
Software development shall comply with the provisions of GJB437, software manuscript preparation shall comply with the provisions of GJB438, and software quality assurance shall comply with the provisions of GIB 439.
3.2.10 Engineering design of man-machine-environment system Engineering design of man-machine-environment system shall comply with the provisions of Article 1.4 of GJB74.5. 3.3 Materials
The selection of materials shall comply with the provisions of Article 4.9 of GJB74.5 and Article 4.1.8 of GJB870. 3.4 Components and parts
The selection and design of components and parts shall comply with the provisions of Articles 4.1 to 4.8 of GJB74.5. 3.5 Reliability
3.5.1 The mean time between failures (MTBF) of the shelter body should be no less than 8200h; 3.5.2 The mean time between failures (MTBF) of the special test equipment should be no less than 500h; 2
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3.5.3 The mean trouble-free range of the shelter carrier shall be in accordance with the index of the SX250DF model: 3.5.4 The mean trouble-free range of the field support vehicle shall be in accordance with the index of the 2041D model; 3.5.5 The average number of trouble-free working times of the lifting mechanism shall be no less than 600 times. 3.6 Maintainability
3.6.1 The mean time to repair (MTTR) of the shelter body, accessories, general equipment and special test equipment shall be no more than 2h. 3.6.2 The mean time to repair the shelter carrier shall be in accordance with the index of the SX250DF model. 3.6.3 The average repair time of the field support vehicle shall be based on the indicators of the 2041D model. 3.6.4 All spare parts shall be replaceable under field conditions. 3.7 Functional characteristics
3.7.1 The faults of the dual 35 fire control system shall be diagnosed and located at the replaceable units at the whole (component) level. 3.7.2 The main performance of the dual 35 fire control system shall be inspected, tested and calibrated. 3.7.3 The dual 35 fire control system shall be repaired by replacing parts. The switches and relays on the central distribution box and the control console panel shall be replaced and repaired.
3.7.4 The replaced spare parts shall be repaired, and the spare parts that cannot be repaired shall be sent to the base-level maintenance station for repair. 3.7.5 It has the function of regular preventive maintenance of the dual 35 fire control system and maintenance of the maintenance shelter and its accessories, general equipment, special diagnostic and testing equipment, carrier and support vehicles. 3.B Performance characteristics
3.8.1 Overall performance
3.8.1. 1 The confidence level of fault diagnosis and positioning of the dual 35 fire control system should be no less than 90%. 3.8.1.2 95% of all faults of the dual 35 fire control system can be repaired. 3.8.1.3 The mean time to repair (MTTR) of fault diagnosis and replacement of dual 35 fire control system should be greater than 1 hour. 3.8.1.4 The variety of spare parts equipped should ensure that the fault repair rate of six fire control units reaches 95%, and the quantity should ensure the needs of six fire control units for five combat days (one combat day is equal to 20 hours of use plus 4 hours of preventive maintenance). 3.8.1.5 The utilization rate of spare parts should be no less than 85%. 3.8.2 Maintenance Shelter
3.8.2.1 The cabin body shall adopt a reinforced large plate structure and shall comply with the provisions of Article 4.5 of GJB870. 3.8.2.2 The sealing performance of the cabin body shall comply with the provisions of Articles 4 and 6 of GJB870. 3.8.2.3 The air conditioning system of the maintenance shelter shall ensure that the time for the cabin to cool down from 50℃ to 38℃ does not exceed 0.5h, and the time for the cabin to heat up from ~40℃ to 5℃ does not exceed 1h. 3.8.2.4 The time for setting up and removing the maintenance shelter system shall not exceed 2 man-hours. 3.8.2.5 The noise level during the operation of the maintenance shelter shall not exceed 80dB. 3.8,2.6 Requirements for the lifting mechanism of the other cabin are as follows: t, each set of 4 lifting mechanisms, the total weight should not exceed 280kgb, the load-bearing capacity of each lifting mechanism should not be less than 25kN; c: the lifting mechanism and the cabin body should be detachably connected; d the stroke of the lifting mechanism should not be less than 1600mm: when rising, 2 people operate (using connecting rods to transmit and bear force steadily), each person's hand crank should not exceed 150N; e.
f. The rising time should not exceed 15min, and the falling time should not exceed 10min. The self-locking device of the lifting mechanism should be safe and reliable, and self-slip landing is not allowed; g
The lifting mechanism should not be rusted or stuck. h.
3.8.2.7 Requirements for the lighting system of the other cabin are as follows: S1 20629-97
Both the workshop and the machine room should have a set of 50Hz, 220V and DC 12V lighting devices, and there should be air defense lighting control measures. 3.8.2.8 Requirements for the ventilation system of the shelter are as follows: The workshop and the machine room should have ventilation devices, and the ventilation holes should be equipped with dust filters, hole covers and safety switches for opening the cover. 3.8.2.9 The power distribution equipment of the shelter includes distribution boxes, switching components and external wiring boards, and the requirements are as follows: a. The power distribution equipment can be powered by the generator set or the mains; 5. In the power distribution system, there should be measures to control and monitor the power station, air compressor, charger and air conditioning, ventilation, lighting, heating and other conditions;
c. The external wiring board should be able to introduce 50Hz220V AC power and 400Hz, 115V three-phase AC power, and lead out 12V DC power and 50Hz, 220V AC power, and be equipped with wiring jacks, sockets, telephone terminals, grounding poles, etc.; d. The switching components should be able to switch AC and DC power, telephone and grounding wires. 3.8.2.10 The general equipment and requirements of the shelter are as follows: a. Gasoline generator set: operating frequency 50Hz, operating voltage 220V, single phase, rated power 6kW; b. Air conditioner: cooling capacity not less than 3000Cu/h, heating capacity not less than 2kW, power consumption 1.5kW (when cooling), power supply 50Hz, 220V single phase, continuous working time 12h, mean time between failures (MTBF) 1000h; c. Air compressor: working pressure 4×105Pa, maximum output 551/min, power supply 50Hz, 220V single phase, equipped with gas transmission software and controllable Pipe joint
d, charger: charging voltage 12V, 24V, adjustable, charging current 1~9A, power supply 50Hz, 220V single phase; e. Storage battery: voltage 12V, capacity not less than 120Ah; f, fluorine filling bottle and testing equipment: refrigerant F12, the testing equipment includes pressure gauge, three-way joint and hose, and its interface should match the double 35 fire control system air conditioning 507 pump and cabin air conditioning compression pump; g, file box: there should be sufficient number and capacity, with lock; h, fitter's workbench and electrical workbench: assembled with square steel pipes and composite fiberboard, should be equipped with drawers and movable seats, and can be locked during marching. The bench workbench should be equipped with a table vise, and the electrical workbench should be equipped with an anti-static rubber sheet; i. Spare parts rack: It should have sufficient strength and volume, be designed as an in-cabin assembly type, be equipped with guide rails, locking mechanisms and supporting mechanisms that match the spare parts box, and be convenient, reliable, flexible, and interchangeable with each spare parts box; J: Tools: The variety and quantity should take into account the actual needs of the double 35 fire control system. The square cabin should be equipped with a full set of common tools, special tools and civil engineering tools, and the field support vehicle should be equipped with common tools. 3.8.2.11 Accessory maintenance square cabins should be equipped with corresponding hanging components, tightening rotary locks, leveling mechanisms, cabin ladders, soil and water tool boxes, cable winches, multi-purpose emergency lights, running lights, table fans, electric hot air heaters, fire extinguishers, condensation meters and emergency number boxes and other accessories. 3.8.2.12 Shelter carrier: Select SX250DF or similar vehicles, and modify them to match the structure of the square cabin. 3.8.3 Field Support Vehicles
Requirements for field support vehicles are as follows:
a. Vehicle type: Modify the 2041D (or similar vehicle) chassis into a passenger car structure. b. Function: The vehicle is equipped with seats, spare parts boxes, tool boxes, document boxes, workbenches and common tools; transport repair personnel, spare parts and testing equipment; cooperate with the shelter to diagnose, inspect, calibrate and replace parts for the fire control system, perform patrol maintenance and emergency repairs; transport repair spare parts to the "base maintenance station" for repair. 3.8.4 Spare parts packaging
3.8.4.1 The requirements for spare parts boxes are as follows:
a. The size and quantity of spare parts boxes are determined according to the size and quantity of spare parts, and should match the size of spare parts racks. 4
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b Spare parts box structure: The box is assembled with wooden plywood, and the outer aluminum skin is reinforced with box corners and edge corners, and the inner wall is pasted with vibration-damping foam rubber sheets. Box The strength and rigidity of the box should be able to meet the requirements for loading and unloading spare parts. The structure of the spare parts box should match the guide rails and locking devices of the spare parts rack, be easy to lift and transport, the box cover should be easy to open and close, the positioning should be accurate, the shape should be beautiful, and it should be interchangeable when installed on the spare parts rack. e. The spare parts box should be rainproof, moisture-proof, dew-proof, dust-proof, vibration-proof, and impact-proof. It should be able to withstand a load of 30kg and fall from a height of 800mzm without damage.
d. The surface of the spare parts box should be marked with the box number, name and high-end brand. 3.8.4.2 The requirements for spare parts packaging and packing are as follows: %: Spare parts are wrapped in plastic film, and the plastic bag should contain the spare parts name, code, quantity and batch number. b. Spare parts should be installed firmly and reliably in the spare parts box, with moderate position and center of gravity, and easy to take and put; devices that are susceptible to electromagnetic damage should be wrapped with shielding materials. The packing list and configuration diagram should be clear. Clear and easy to read. c. Spare parts are packed according to the spare parts list, packing list and packaging instructions, and sealed after inspection. 3.8.5 Testing equipment
3.8.5.1 General testing equipment and requirements are as follows: a. Portable dual-trace oscilloscope with a bandwidth of not less than 100MHzb. An appropriate number of digital and pointer multimeters: c. Anemometer that can measure wind speed not less than 40m/s; d. An appropriate number of megohmmeters and thermometers and hygrometers. 3.8.5.2 Special testing equipment and requirements are as follows: d. Test box: The test box is used to diagnose and locate faults of the fire control system under the control of the fire control computer. Its electrical interface should match the fire control system, and its mechanical interface should match the cabin spare parts rack. The weight of the test box shall not exceed 30kg. b: Fire control system simulator: used to simulate the output signal of the fire control system No., check whether the artillery is working normally. Its cable is connected to the DT external terminal board, and its external dimensions should match the spare parts rack of the cabin. The weight shall not exceed 25kg. C: Artillery initial velocity simulator: used to strictly generate the initial velocity signal of the artillery and check whether the fire control system is working normally. Its cable is connected to the artillery, and its external dimensions should match the spare parts rack of the cabin. The weight shall not exceed 8kg. . Radar calibrator: used to check and calibrate the parallelism between the dual 35 fire control system radar, television, laser and calibration optical axes, and check the angle error voltage slope of the radar antenna. Radar calibration should only be designed to be detachable, loaded into the spare parts box and then loaded into the spare parts rack, and its weight shall not exceed 20kge
e. Diagnostic auxiliary equipment: including various adapters, transfer cables and transfer boards, mainly used for measurement and transfer between special detection equipment and fire control system. Put the diagnostic auxiliary equipment into the spare parts box and place it on the spare parts rack of the cabin. 3.8.6 Communication equipment
The communication equipment consists of a base station in the shelter and a mobile station in the fire control unit. It is wireless communication, with a communication distance of not less than 10km and a communication channel of not less than 10.
3.8.7 Maintenance documents
3.8.7.1 The maintenance documents of the dual 35 fire control system shall comply with the regulations of GJB20148. 3.8.7.2 The maintenance documents of the dual 35 fire control system include the following: a. Technical specifications of the dual 35 fire control system:
b, Instructions for use of the dual 35 fire control system;
c. Maintenance instructions for the dual 35 fire control system (including fault diagnosis test table); d, Schematic diagram of the dual 35 fire control system, three-dimensional decomposition atlas and photo album; e. Spare parts, tools, consumable materials list and packing list for field maintenance of the dual 35 fire control system: f, Instructions for use of the maintenance shelter system;
g, Instructions for use of various testing equipment:
h. Maintenance document directory.
3.9 Safety
SJ 20629—97
The power supply system should have good grounding safety protection and over-teaching indication measures. 3.10 Electromagnetic compatibility
a. The comprehensive suppression capability of the cabin body to electromagnetic interference within the frequency range of 0.15~10000MHz bandwidth should not be less than 40dB;
b. The electromagnetic compatibility of special testing equipment shall comply with the provisions of the relevant specifications. 3.11 Environmental adaptability
3.11.1 General environmental requirements shall comply with Chapter 3 of GJB 74.6. 3.11.2 High temperature
Working temperature: +50℃;
Storage temperature: +70.
3.11.3 Low temperature
Working temperature: -40℃;
Storage temperature: 55.
3.11.4 Humidity and heat
Relative humidity is 95% ± 3%, and the ambient temperature is 30 ~ 35. 3.11.5 Low pressure
Air pressure: 70kPa or 3000m above sea level.
3.11.6 Sealing
3.11.6.1 Light tightness: No direct light is allowed to leak out. 3.11.6.2 Rain: Rain intensity is 5~7mm/minc3.11.6.3 Immersion depth: 550mm.
3.11.6.4 Dust: During the 300km test of the sports car, the dust collected on the workbench should not exceed 0.5g/m2. 3.11.7 Wind resistance
3.11.7.1 When the lifting mechanism is raised, the shelter should be able to withstand the wind load of a steady wind speed of 17m/s (windy wind 25m/s). 3.11.7.2 When the lifting mechanism is lowered, the shelter should be able to withstand the wind load of a steady wind speed of 40m/s (windy wind 60m/s). 3.11.8 Salt spray
External surface components and other structural parts should have the ability to resist salt spray corrosion. 3.11.9 Mold
The parts have the ability to resist mold, and the shelter materials and process measures can effectively inhibit the growth of mold. 3.11.10 Solar radiation
Can withstand sunlight.
3.11.11 Transportability
3.11,11.1 The requirements for military vehicle transportation are as follows: 1000km for the appraisal test and 200km for the delivery test. 3.11.11.2 The requirements for railway transportation are as follows:
The cabin should be able to withstand the impact of railway transportation. 6
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311,11.3 The requirements for towing power are as follows:
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The cabin equipped with a slide should be able to withstand a towing power of 0.5Mg (M is the total mass of the cabin, which is the gravitational acceleration, the same below). 3.11.11.4 The requirements for helicopter lifting are as follows: The cabin should withstand the load during helicopter lifting. 3.12 Marking and code
The marking and code of the shelter shall comply with the relevant provisions of GJB1349 and the requirements of Article 3.6.3 of GJB74.5. 3.13 Surface condition and color
, surface treatment shall comply with the provisions of Article 4.11 of GJB74.5. b. The color shall comply with the provisions of Article 4.11.3 of GJB74.5. 3.14 Appearance quality
The appearance quality of the shelter shall comply with the provisions of Article 4.1.11 of GJB870. 4 Quality assurance provisions
4.1 Inspection responsibility
Unless otherwise specified in the contract or order, the contractor shall be responsible for completing all inspections specified in this specification. If necessary, the ordering party or the superior appraisal agency has the right to inspect any inspection item described in the specification. 4.1.1 Qualification responsibility
All products must meet all requirements of Chapter 3 and Chapter 5 of the specification. The inspections specified in this specification shall be an integral part of the contractor's entire inspection system and quality program. If the contract includes inspection requirements not specified in this specification, the contractor shall also ensure that the products submitted for acceptance meet the contract requirements. Quality consistency sampling does not allow the submission of products that are known to be defective, nor can the ordering party be required to accept defective products. 4.2 Inspection categories
The inspections specified in this specification are divided into:
a. Identification inspection;
b. Quality consistency inspection.
4.3 Inspection conditions
4.3.1 Environment and site
In principle, the inspection shall be carried out under the natural environment conditions of the contractor. If the local climatic conditions and site conditions at that time have an impact on the test results, they shall be handled in accordance with Article 3.1 of GIB 74.6. 4.3.2 Instruments and meters
They shall comply with the provisions of Article 3.2 of GJB74.6. 4.4 Identification inspection
Identification inspection shall conduct a comprehensive assessment of product quality and conduct all inspections in accordance with the specified technical requirements. If necessary, additional inspection items may be added with the approval of the ordering party and the contractor. 4.4.1 Identification inspection shall be carried out in the following cases: a. Product design finalization or production finalization;
b. Product conversion trial finalization;
center, product resumption after long-term suspension; d. Product design, manufacturing process, key components and materials have major changes that may affect product performance. 4.4.2 Inspection items
SI20629-97
Unless otherwise specified, inspection items shall be as specified in Table 1. Table 1
Inspection items
Components and parts
Reliability
Maintainability
Functional characteristics
Fault diagnosis and location
Inspection and testing
Spare parts repair
System maintenance
Overall performance
Fault location reliability
Fault repair rate
Mean repair time
Spare parts requirements
Spare parts utilization
Maintenance shelter| |tt||Cabin structure
Cabin sealing
Space system
Removal time
Workroom noise
Lifting mechanism
Lighting system
Ventilation system
Power distribution equipment
General equipment
Gasoline generator set
Air conditioner
Air compressor
Appraisal and inspection
Quality consistency inspection
"Requirement\Chapter number
3.8.2 .10a
3.8.2.10b
3.8.2.10c
“Test method\
Chapter number
4.7.8.10a
4,7.8.10b
4.7.8.10c
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Test items
Charger
Battery
Nitrogen filling bottle
File box
Workbench
Spare parts rack
Shelter carrier
Field support vehicle
Spare parts packaging
General testing equipment
Special testing equipment
Communication equipment
Maintenance documents
Safety
44Electromagnetic compatibility
Environmental adaptability
Low pressure
Diffusion detection
Wind resistance
Solar radiation
Annual automobile transportation
Identification and inspection
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Continued Table 1
Quality consistency inspectionwww.bzxz.net
Group C Group D
“Requirement\’s chapter number
3.8.2.10d
3.8.2.10c
3.8.2.10f
3.8.2.10g
3.8.2.10h
3.8.2.101
3.8.2.10j
3.11.11.1
“Inspection method”’s chapter number
4.7.8.10d
4.7.B.10d
4.7.B.10e
4.7.8.10f
4.7.8.10F
4.7.8.10f
4.7.8.10[
Inspection items
58 Railway transportation
Helicopter lifting
Marking and code
Surface condition and color
Pre-nesting
Identification inspection
SI 20629-97
Continued Table 1
Quality consistency inspection
Group A Group IB
Note: “\ indicates a required item; \\ indicates an unnecessary item; “○\ indicates an optional item. 4.4.3 Defect classification
According to the original classification of Appendix R of GJB74.9, the following defects are classified: "Requirements\'s chapter number
3.11.11,2
3.11.11.3
3.11.11.4
Fatal defects: Generator sets are not redundant; the ropes, rotary locks, ladders and lifting mechanisms are unreliable; "Inspection methods"
's chapter number
Serious defects: Diagnostic and testing equipment, general equipment and vehicles fail and cannot work; spare parts cannot be replaced or interchanged; shelters are not sealed;
Minor defects: Diagnostic and testing equipment, general equipment and the car is faulty but still works; loud noise; poor shielding; equipment appearance does not meet the requirements; size is out of tolerance; heating and cooling speed is not enough: poor performance of file use; incomplete spare parts or low utilization rate. 4.4.4 Handling of quality issues of new products
When newly developed products are subjected to various inspections during the identification and inspection process, if unqualified conditions are found, the problems should be analyzed, improvement measures should be taken, and retests should be conducted until the tests are fully qualified. 4.4.5 Maintenance of qualification for identification
The contractor shall submit test data regularly. The submission frequency shall be consistent with that of the fire control system. 4.5 Quality consistency inspection
4.5.1 Inspection items
Unless otherwise specified, the inspection items and sequence shall be as specified in Table 1. 4,5.2 Inspection grouping
Inspections are generally divided into four groups: A, B, C, and D (as specified in Article 4.3 of GJB74.9). 4.5.3 Implementation of inspection
4.5.3.1 A Group inspection
4.5.3.1.1 All shelter systems produced in batches or in single trial production shall pass Group A inspection. 4.5.3.1.2 The contractor shall provide the ordering party with technical data and necessary equipment, instruments, tools and sites. 4.5.3.1.3 The submitted shelter system shall be inspected and qualified by the contractor's quality inspection department, and shall be accompanied by routine inspection records signed by the quality inspection department.
4.5.3.1.4 Inspection method: With the cooperation of the contractor, the ordering party shall conduct a full inspection. 4.5.3.1.5 Group A inspection generally adopts the method of submission by unit and judgment by unit. If any of the following situations occurs, the product shall be judged as unqualified:
a. Fatal defects are found;
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