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PWA 86453 PUMP
L-A7905 (0000)
Adapter Installation Figure 704 (Sheet 2)
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
(g) Make compressed air at 75-105 psig (517.1-723.9 kPa) flow through the EEC PT4.95 manifold (AS03) and the probes for 2 (two) minutes.
S 867-094-N00
(3)
Do the steps that follow to put the airplane back to its usual condition.
(a)
Remove the adapter from the manifold.
CAUTION: DO NOT APPLY LUBRICANTS TO THE EEC PT4.95 TUBE NUT.
_______
CONTAMINATION OF THE EEC AND DAMAGE CAN RESULT.
(b) Connect the EEC PT4.95 tube (AS02) to the EEC PT4.95 manifold (AS03): 1) Remove the protective cover. 2) Install the rear EEC PT4.95 tube to the EEC PT4.95 manifold
(AS03). 3) Tighten the tube nut with your hand. 4) Install all the clamps that you removed.
a) Make sure all the clamps are tight. 5) Torque the tube nut to 270-300 pound-inches (30.506-33.895 newton-meters). 6) Install lockwire or the safety cable and safety cable ferrule on the tube nut.
WARNING: OBEY THE INSTRUCTIONS IN AMM 78-31-00 WHEN YOU CLOSE THE _
_______ THRUST REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS, INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
(c)
Close the thrust reversers (AMM 78-31-00/201).
(d)
Close the core cowl panels (AMM 71-11-06/201).
(e)
Close the fan cowl panels (AMM 71-11-04/201).
(f)
Do the activation procedure for the thrust reversers
(AMM 78-31-00/201).
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COMPRESSOR SECTION - DESCRIPTION AND OPERATION
______________________________________________
1. General
_______
A. The compressor section consists of the low pressure compressor (LPC), low pressure compressor (LPC)/low pressure turbine (LPT) coupling, fan case, intermediate case, and high pressure compressor (HPC).
B. The primary purpose of the compressor section is to compress the ambient
air entering the engine inlet and to deliver the compressed air to the
diffuser/combustor section for combustion.
2. Low Pressure Compressor (LPC) (Fig. 1)
_____________________________
A. The low pressure compressor (LPC) consists of a five stage (1st-, 1.6th-, 2nd, 3rd, and 4th-stage) rotor and a four stage (1st-, 1.6th-, 2nd, and 3rd-stage) stator. The stator is attached to the inner fan exit case and the rotor is supported through the intermediate case. The purpose of the low pressure compressor is to provide the initial compression of ambient air which will be used to generate propulsive force. The 4th-stage compressor stator is addressed as part of the intermediate case.
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