(m)
Tighten the bolt that holds the outer rod-end bearing to the mount bracket to 85-95 pound-inches (9.6-10.7 newton-meters).
(n)
Tighten the bolts that attach the mount bracket to the bracket on the buffer air cooler to 85-95 pound-inches (9.6-10.7 newton-meters).
(o)
Install the buffer air cooler with the steps that follow: 1) Loosen the 14 bolts and nuts in the supports at the axial edges of the buffer air cooler. 2) Install the buffer air cooler and the classified spacer plate on the intermediate case.
3) Measure the distance between the buffer air cooler and the intermediate case at the trailing edge. a) If necessary, use a different spacer for the correct
installation (Refer to flagnote 1 for the correct
dimension).
4) Tighten the bolts and nuts in the supports to 85-95
pound-inches (9.6-10.7 newton-meters).
5) Lubricate the threads of the screws, which attach the
buffer air cooler, with engine oil.
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
6) Attach the buffer air cooler with the screws. a) Tighten the screws to 36-40 pound-inches (4.1-4.5 newton-meters).
(p) Apply the sealant around the edges of the buffer air cooler at the Y locations in Fig. 401. 1) Clean the edges of the buffer air cooler with a clean
cheesecloth made moist with the alcohol. 2) Let the cleaned areas dry and make sure there is no remaining alcohol on the surfaces. 3) In less than two hours after you cleaned the parts, fill the spaces at the Y locations with the sealant. 4) Let the sealant dry for a minimum of eight hours before you operate the engine.
NOTE: A minimum relative humidity of the air of 25% is
____ necessary for the correct curing of the sealant.
(q)
Lubricate the threads of the adapters on the buffer air cooler with the antigalling compound.
(r)
Connect the cooling air tubes to the adapters. 1) Tighten the tube nuts to 825-900 pound-inches (93.2-101.7 newton-meters).
2) Safety the tube nuts with lockwire or safety cable and safety cable ferrule.
G. Return the Aircraft to Its Usual Condition.
S 414-024-N00
WARNING: OBEY THE INSTRUCTIONS IN AMM 78-31-00/201 WHEN YOU CLOSE THE
_______ THRUST REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS, INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
(1)
Close the right thrust reverser (AMM 78-31-00/201).
(2)
Close the right core cowl panel (AMM 71-11-04/201).
(3)
Close the right fan cowl panel (AMM 71-11-04/201).
S 444-023-N00
(4)
Do the activation procedure for the thrust reverser
(AMM 78-31-00/201).
S 414-022-N00
S 414-021-N00
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S 714-016-N00
(5) Do the test of the buffer air cooler for the No. 3 bearing that is shown in the Power Plant Test Reference Table (AMM 71-00-00/501).
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ENGINE EXTERNAL ACCESSORIES COOLING - DESCRIPTION AND OPERATION
_______________________________________________________________
1. General (Fig. 1)
_______
A. Engine external accessories cooling is done by fan air which is bled to the nacelle zone area, and fan air into the specific components that cooling is necessary. These components include exciter-to-igniter plug cables, igniter plugs, starter, start valve, integrated drive generator (IDG), electronic engine control (EEC) alternator (N2 transducer), HPC secondary flow control valves, and oil quantity transmitter.
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