C.
Procedure
S 864-040-N00
(1) For the applicable engine, open this circuit breaker on the main power distribution panel, P6, and attach a DO-NOT-CLOSE tag:
(a) 6G15 SCU ALT PWR ENG 1
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
SEE B
SEE A FLANGE S FLANGE T FLANGE P FLANGE P FLANGE T FLANGE S
(4 PLACES) PROBE THERMOCOUPLE EGT (TT4.95) PROBE EPR (PT4.95) SEE D
TURBINE CASE EXHAUST TURBINE CASE EXHAUST
PROBE EPR (PT4.95) CSEE
A FWD B FWD
Engine Pressure Ratio (PT4.95) Probe Installation Figure 401 (Sheet 1)
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CLAMP
SCREW
NUT
PRESSURE BOLT
MANIFOLD (2 PLACES)
TUBE NUT
EPR (PT4.95) THERMOCOUPLE EGT (TT4.95) EGT (TT4.95)
PROBE PROBE THERMOCOUPLE
SEE E PROBE (REF)
10 O'CLOCK POSITION
C
BOLT
EPR (PT4.95) PRESSURE MANIFOLD
EGT (TT4.95)
THERMOCOUPLE
PROBE EPR (PT4.95)
EGT
EPR (PT4.95) PROBE HARNESS
PROBE
BRACKET
SEE E
PRESSURE MANIFOLD TUBE NUT
CLAMP SCREW NUT
4 O'CLOCK POSITION
D E
Engine Pressure Ratio (PT4.95) Probe Installation Figure 401 (Sheet 2)
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
(b)
6G23 ENG SCU 1
(c)
6G16 SCU ALT PWR ENG 2
(d)
6G24 ENG SCU 2
(e)
6G17 SCU ALT PWR ENG 3
(f)
6G25 ENG SCU 3
(g)
6G18 SCU ALT PWR ENG 4
(h)
6G26 ENG SCU 4
S 014-017-N00
(2)
Open the core cowl panels (AMM 71-11-06/201).
S 034-018-N00
(3)
Remove the nuts and the lockwashers that attach the wires to the EGT probe.
(a) Remove the wire ends from the EGT probe.
S 034-019-N00
(4) Do the steps that follow to remove the EGT probe at the 10 o'clock position:
(a)
Remove the bolt and the nut for the clamp that is attached to the bracket on the pressure manifold.
(b)
Remove the lockwire and disconnect the pressure manifold from the pressure probe.
(c)
Loosen the bolts that attach the pressure manifold to the brackets on the flange T.
NOTE: This will give you the clearance to remove the EGT
____
probe.
(d)
Remove the lockwire and the two bolts that attach the EGT probe to its housing on the turbine exhaust case.
(e)
Remove the EGT probe from the turbine exhaust case.
S 034-020-N00
(5) Do the steps that follow to remove the EGT probe at the 4 o'clock position:
(a)
Remove the bolt and the nut that attaches the clamp for the EGT probe wires to the pressure manifold.
(b)
Remove the lockwire and disconnect the pressure manifold from the pressure probe.
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