S 714-028-N00
(9)
Do the test of the EGT probe that is shown in the Power Plant Test Reference Table (AMM 71-00-00/501).
S 714-016-N00
(10)
Do this task: Engine Pressure Ratio Indicating System Operational Test (AMM 77-11-00/501).
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747-400 MAINTENANCE MANUAL
ENGINE PRESSURE RATIO (EPR) PT4.95 PROBE - ADJUSTMENT/TEST
__________________________________________________________
1. General_______
A. This procedure is a leak test of the Engine Pressure Ratio (EPR) PT4.95 Probe system. Repair any leaks that you find during this test.
B. There are two Engine Pressure Ratio (EPR) PT4.95 probes installed in the turbine exhaust case at approximately the 4 and 10 o'clock positions.
C. The Engine Pressure Ratio (EPR) PT4.95 probe is referred to as the EPR probe in this procedure.
TASK 77-11-01-705-001-N00
2. Do a Leak Test of the Engine Pressure Ratio (EPR) PT4.95 Probe System_____________________________________________________________________
A. References
(1)
AMM 77-11-00/501, Engine Pressure Ratio Indicating System
(2)
AMM 77-11-01/601, Engine Pressure Ratio (EPR) PT4.95 Probe
(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
B.
Access
(1)
Location Zones
410 Engine 1
420 Engine 2
430 Engine 3
440 Engine 4
(2)
Access Panel
414 Right Fan Cowl Panel - Engine 1
417 Left Core Cowl Panel - Engine 1
418 Right Core Cowl Panel - Engine 1
424 Right Fan Cowl Panel - Engine 2
427 Left Core Cowl Panel - Engine 2
428 Right Core Cowl Panel - Engine 2
434 Right Fan Cowl Panel - Engine 3
437 Left Core Cowl Panel - Engine 3
438 Right Core Cowl Panel - Engine 3
444 Right Fan Cowl Panel - Engine 4
447 Left Core Cowl Panel - Engine 4
448 Right Core Cowl Panel - Engine 4
C.
Equipment
(1)
Regulator (air pressure), with isolation shutoff
valve
(2)
Pressure Gage, with a range of 10 PSIG (68.9 KPa), and a precision of |10 percent
(3)
Tygon Flexible Tubing, 0.250 inch (6.350 mm) ID
or the equivalent
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747-400
MAINTENANCE MANUAL
(4)
Ground Pneumatic Cart, to supply clean dry air
at 10 PSIG (68.9 KPa)
(5)
PWA 102283 - Kit, EPR PT4.95 Pressure
NOTE: This kit is for the 4 port probe, installed with Pratt &
____ Whitney SB77-16. There is no Pratt & Whitney manufactured kit for the 6 port probe.
D. Consumable Materials
(1)
G02151 Fluid, Leak Check (bubble type) PMC 9569
(2)
G02334 Lockwire, (P05-289) 0.032 inch (0.813 mm) - AS3214-02
(3)
G02335 Cable, Safety (P05-291)
(4)
G02332 Ferrule, Safety Cable (P05-292)
E. Do a test of the EPR Probe System (Fig. 501).
S 865-002-N00
(1) Prepare for the test.
WARNING: DO THE THRUST REVERSER DEACTIVATION PROCEDURE TO PREVENT
_______ THE OPERATION OF THE THRUST REVERSER. THE ACCIDENTAL OPERATION OF THE THRUST REVERSER CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
(a)
Do this procedure: Thrust Reverser Deactivation for Ground Maintenance (AMM 78-31-00/201).
(b)
Open the fan cowl panels (AMM 71-11-04/201).
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