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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A
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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E82284
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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)
中國航空網 www.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：747-400 AMM 飛機維護手冊 STANDARD PRACTICES - AIRFRAME(155)
