(e)
Remove the DO-NOT-OPERATE tag from the APU master switch on the P5 forward overhead panel.
(f)
Start and operate the APU (AMM 49-11-00/201). 1) Let the APU operation become stable with no load applied. 2) Make sure the exit for the bleed air valve is clear.
(g)
Make sure the engine speed is stable at 101.3 to 102.5 percent (41,500 to 41,800 RPM) as shown on the tachometer indicator on the engine tester, or 405-410 CPS on the FREQ meter located on the the P5 forward overhead panel.
(h)
Set the APU BLEED valve switch on the P5 forward overhead panel to the ON position.
(i)
Set the air conditioning R PACK and L PACK valve switches on the P5 forward overhead panel to the ON position.
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(j) Let the APU speed become stable.
NOTE:____ The APU speed is shown on tachometer indicator on the engine tester or the FREQ meter located on the the P5 forward overhead panel.
(k) Monitor the EGT indication at the engine tester and at the EGT indicator on the P5 forward overhead panel:
NOTE:____ The EGT indication from the EGT indicator must be |17°C (|30°F) of the EGT indication from the engine tester.
(l) (m) (n) (o) (p) (q) (r) (s) 1) Make a record of the EGT indication on the engine tester. 2) Make a record of the EGT indication on the EGT indicator on the P5 forward overhead panel.Do the APU usual shutdown (AMM 49-11-00/201).Attach a DO-NOT-OPERATE tag to the APU master switch on the P5 forward overhead panel.Open this circuit breaker and attach a DO-NOT-CLOSE tag: 1) E3-3 Electrical Shelf, APU Control UnitRemove the locknuts from the studs on the side of the ETC thermocouple probe in the tailpipe.Disconnect the leads of the electrical cable or adapter cable assembly from the studs on the side of the ETC thermocouple probe.Install the locknuts to the studs on the side of the ETC thermocouple probe.Do the above test steps again at the studs on the bottom of the ETC thermocouple probe.Do a check of the EGT indications for each set of studs: 1) If the EGT indications for the two ETC thermocouple probes are within 25°C of each other, no adjustment is necessary. 2) If the EGT indicator on the P5 forward overhead panel reads within 12°C of the highest probe indication, no adjustment is necessary.
NOTE:____ The 12°C maximum difference is measured between the
ETC probe studs and the ETC indicator. This measurement shows the resistance of the thermocouple leads.
3) 4) If the EGT indicator on the P5 forward overhead panel does not read within 12°C of the highest probe indication, do the test for the EGT indicating system (AMM 49-71-00/501).If the EGT indications for each set of studs for the ETC thermocouple probe are not within 25°C, do these steps: a) Do a check of the circuit for the No. 1 thermocouple probe between the receptacle D10112, pin A and pin B.
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////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES/MAINTENANCE MANUAL ////////////////////////
b) Do a check of the circuit for the No. 2 thermocouple probe between the receptacle D10112, pin C and pin D.
c) If there is a problem with the thermocouple loop(s), replace as necessary.
S 415-006
CAUTION: KEEP A MINIMUM CLEARANCE OF 0.18 INCHES (5 MM) BETWEEN THE
_______ ENGINE, THE FIRE DETECTOR, THE CLAMPS, AND THE LOWER SHROUD.
BE CAREFUL WHEN YOU MOVE THE LOWER SHROUD. DAMAGE TO THE
SHROUD DRAIN LINES CAN OCCUR.
(5) Install the lower shroud: (a) Hold the lower shroud against the upper shroud. (b) Close the shroud latches.
S 415-007
(6) Close the APU cowl door: (a) Disconnect the door support rods. (b) Put the door support rods in the clips on the APU cowl door. (c) Close the APU cowl door. (d) Close the latches for the APU cowl door.
S 865-008
(7) Set the circuit breaker and the switch: (a) Remove the DO-NOT-CLOSE tag and close this circuit breaker: 1) E3-3 Electrical Shelf, APU Control Unit (b) Remove the DO-NOT-OPERATE tag from the APU master switch on the P5 forward overhead panel.
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