747-400 AMM 飞机维护手册 STANDARD PRACTICES - AIRFRAME(155)

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BACC10EY()B  425-800 150-800  105 
150-400  75 
BACC10EZ()B  125-275  75 
300  105 
125-300 
BACC10GY()  150-175  40 
200-275  45 
300-450  50 
475-600  55 
650-900  65 
BACC10HX()  100-300  10 
325-500  15 
550-800  20 
NUCO (U430453)  125  55-65 
BACC10KH  200-275  45 
300-475  55 
500-550  60 
600-650  65 
700  70 
BACC10AC  150-200  40-50 
225-300  60-70 
315-550  120-140 

COUPLING CLAMPS, V-BAND, AND CHANNEL-BAND
1

1
THE RECOMMENDED TIGHTENING PROCEDURE IS AS FOLLOWS:
1. APPLY THE INSTALLATION TORQUE AS GIVEN IN THE TABLE.
2. HIT THE ENTIRE CIRCUMFERENCE OF THE CLAMP LIGHTLY WITH A WOOD, LEATHER, OR SOFT PLASTIC MALLET.
3. DO STEPS 1 AND 2 UNTIL THE TORQUE WILL STAY CONSTANT.
Standard Torque Values for Clamps
Figure 209 (Sheet 1)

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747-400
MAINTENANCE MANUAL

CHANNEL BAND CLAMPS 
TYPE  DUCT OD (INCHES)  (POUND-INCHES) TORQUE 
BACC10CT  1.00-6.00  100-105 2

DUCT-SUPPORT CLAMPS 
TYPE  DUCT OD (INCHES)  TORQUE (POUND-INCHES) 
BACC10AD  2.00-8.00  20-25 

HOSE CLAMPS 
HOSE OD  TORQUE 
TYPE  (INCHES)  (POUND-INCHES) 
BACC10BN  1.75-20.00  20 

ROYLYN COUPLING 
DUCT OD  TORQUE 
TYPE  INCHES/MATERIAL  (POUND-INCHES) 
BACR12H  1.50/5052-0  600-1000 
1.50/STAINLESS  900-1200 
2.00/5052-0 1.75/5052-0  1300-2500 900-1200 
2.50/5052-0  2000-3000 

INSIDE OF COUPLING IS NOT LUBRICATED.
Standard Torque Values for Clamps
Figure 209 (Sheet 2)

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747-400 MAINTENANCE MANUAL
 CIRCUIT BREAKER RESET - MAINTENANCE PRACTICES
_____________________________________________
 TASK 20-60-01-862-001
 1.  Circuit Breaker Reset_____________________
 A. General
 (1)  
This procedure is for on-the-ground maintenance.

 (2)  
Circuit breakers open when there is an electrical overload in the airplane system. A circuit breaker that opens because of an electrical overload is known as a "tripped" circuit breaker.

 (3)  
If there are currently specific instructions for the reset of a tripped circuit breaker in maintenance and troubleshooting procedures, follow those instructions.

 (4)  
A defective circuit breaker can cause the circuit breaker to open. Make sure that the circuit breaker is serviceable.

 (5)  
Use your judgement and airline policy to reset a tripped circuit breaker.

 (6)  
Monitor the airplane to see if a tripped circuit breaker occurs again on subsequent flights.

 (7)  
Do not reset a tripped circuit breaker until you know the cause for the tripped circuit breaker and that the circuit breaker can be safely reset. Fires have occurred in which the tripped circuit breakers were reset without an examination of the cause.

 (8)  
Use this procedure to reset a tripped circuit breaker:

 (a)  
If you know that the circuit breaker is serviceable.

 (b)  
If this procedure is in agreement with your airline policy.

 (c)  
If you cannot determine the cause for the tripped circuit breaker.

 (d)  
If you cannot determine whether it is safe to reset the circuit breaker.

 

 B. References
 (1)  
　
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
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