747-400 AMM 飞机维护手册 动力装置 POWER PLANT 1(59)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
TEST NO. 4 - POWER AND ACCELERATION/DECELERATION TEST
_____________________________________________________
 (i) (j)  Operate the engine at approach idle for 15 minutes. It is necessary to stabilize the engine at approach idle prior to snap acceleration.With a stop watch, prepare to time the engine acceleration from approach idle to 1.23 EPR.
 (k)  Quickly (1 second or less) move the forward thrust lever from the approach idle position to the 1.25 EPR position recorded earlier.
 1)  Measure the time of the acceleration from approach idle to 1.23 EPR.
 (l)  2) Make sure the acceleration time is 5.7 seconds or less to the 1.23 EPR target.Let the engine become stable for 30 - 35 seconds. 1) Make sure the engine does not go more than the 1.25 EPR
 (m)  target.Quickly (1 second or less) move the forward thrust lever to idle position. 1) Measure the time of the deceleration from 1.25 EPR to 1.08 EPR.
 (n)  2) Make sure the deceleration time is 6.0 seconds or less to the 1.08 EPR target.Make sure the engine becomes stable at minimum idle.

 S 865-225-N00
 (10)
 After 5 minutes at minimum idle, use the Power Plant Operation (Normal) procedure to do the engine shutdown (AMM 71-00-00/201).

 S 815-233-N00

 (11)
 Look at the EICAS display for EICAS messages.

 (a)  If there are EICAS message, do the necessary corrections in the FIM 71-EICAS messages.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
TEST NO. 5 - OIL SYSTEM STATIC LEAK TEST
________________________________________
 TASK 71-00-00-705-028-N00
 7.  Test No. 5 - Oil System Static Leak Test________________________________________
 A. General
 CAUTION: DO NOT SUPPLY MORE THAN 10 PSIG (68.9 KPA) PRESSURE OR 325°F
_______ (163°C) TEMPERATURE AIR IN THE GEARBOX. DO NOT MOTOR THE ENGINE DURING THIS TEST. IF YOU MOTOR THE ENGINE WHILE THE OIL SYSTEM IS PRESSURIZED, OIL CONTAMINATION OF THE COMPRESSORS AND GASPATH CAN OCCUR.
 (1)  
The static leak test will pressurize the gearbox with air through an external fitting installed to the deoiler outlet tube on the gearbox. This static leak test will also do a check for leaks. An internal pressure of 10 psig (68.9 kPag) is sufficient time to find leakage. Higher pressure can cause the carbon seals to move in the compartments of the main shaft bearing which are connected to the gearbox.

 B.
Special Tools and Equipment

 (1)  
PWA 85700 Adapter

 C.
Standard Tools and Equipment

 (1)  
Air Supply - the pneumatic engine start unit
 can supply air to a maximum of 150
 pounds per hour (68 Kg/hr) flow,
 10 psig (68.9 kPag) max regulated
 pressure, and 320°F (160°C) max
 regulated temperature

 (2)  
Hose and Fittings - used on the outlet tube of
 the oil system drain on the
 front and rear drains

 (3)  
Pint Bottle of Water

 D.
Consumable Materials

 (1)  
G00835 Leak Check - Bubble Type (you can also
 use a soap and water
 solution)

 E.
References

 (1)  
AMM 12-13-03/301, Engine - Oil Replenishing

 (2)  
AMM 71-00-00/201, Power Plant

 (3)  
AMM 71-11-04/201, Fan Cowl Panels

 (4)  
AMM 71-11-06/201, Core Cowl Panels

 (5)  
AMM 78-31-00/201, Thrust Reverser System

 F.
Access

 (1)  
Location Zone
 412 Engine 1
 422 Engine 2
 432 Engine 3
 442 Engine 4

 

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