(c)
Connect one airplane lead to coarse adjustment terminal A3 and other airplane lead to vernier adjustment terminal B2 (Fig.502).
CIRCUIT RESISTANCE AMBIENT TEMPERATURE
13.53 +0.05 OHMS 13.50 +0.05 OHMS 13.47 +0.05 OHMS 13.44 +0.05 OHMS 13.41 +0.05 OHMS 30° +5°C 20° +5°C 10° +5°C 0° +5°C 10° +5°C 86° +9°F 68° +9°F 50° +9°F 32° +9°F 14° +9°F
Circuit Resistance Values 500
49-71-0 Figure 501 Aug 01/94
Page 502
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
500
Aug 01/94 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 49-71-0 Page 503
G02453
APU Exhaust Gas Temperature Indicating System Adjustment 500
49-71-0 Figure 502 Jun 20/83
Page 504
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
(d)
Using soldering iron, disconnect resistance spool wire ends from coarse adjustment terminal A5 and vernier adjustment terminal B3.
(e)
Remove old resistance spool and replace with new or spare spool.
(f)
Thoroughly scrape insulation from end of wire emerging from center of new spool.
(g)
Solder cleaned wire end to coarse adjustment terminal A5.
(h)
Connect one lead of wheatstone bridge or the multimeter to vernier adjustment terminal B3.
(i)
Remove enough insulation from loose end of resistance wire to make a good contact with wheatstone bridge or the multimeter lead; then connect other lead of wheatstone bridge or the multimeter to wire.
(j)
Measure circuit resistance and record.
(k)
Remove lead of wheatstone bridge or the multimeter from loose end of resistance wire.
(l)
On the basis of approximately 0.7 ohm resistance per foot of wire, unwind amount of wire necessary to give approximately correct resistance.
(m)
Remove enough insulation from resistance wire to make a good contact with wheatstone bridge or the multimeter lead; then connect other lead of wheatstone bridge or the multimeter to wire. Move lead along wire, removing wire insulation as required, until resistance value shown in Fig. 501 is obtained.
(n)
Cut wire at this point and remove wheatstone bridge or the multimeter from circuit.
(o)
Thoroughly scrape insulation from end of wire.
(p)
Wind excess wire back on spool and once around center post, leaving sufficient length of wire to reach vernier adjustment terminal B3 for soldering.
(q)
Solder end of wire to terminal.
(r)
Remove jumper from EGT indicator plug.
(s)
Check circuit resistance per steps (2) and (3).
(8) Install resistor cover.
D. Restore Airplane to Normal Configuration
(1)
Connect plug to EGT indicator (if disconnected), safety wire, and install indicator on forward overhead panel.
(2)
Remove jumper from EGT receptacle in upper shroud.
(3)
Connect plug to receptacle in upper shroud and safety wire.
(4)
Position lower shroud against upper shroud and close shroud latches.
CAUTION: MAINTAIN A MINIMUM CLEARANCE OF 0.18 INCH BETWEEN ENGINE PLUMBING, FIRE DETECTOR, CLAMPS AND INSIDE SURFACE OF LOWER SHROUD.
EXERCISE EXTREME CARE NOT TO DAMAGE SHROUD DRAIN LINES WHEN HANDLING SHROUD.
(5)
Disengage APU compartment access door rods and stow rods. Close and latch APU access door.
(6)
Close the circuit breaker on M280 module-APU accessory unit on E3-3 electronic shelf.
(7)
Position BATTERY SWITCH to ON and remove placards.
500
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EXHAUST GAS TEMPERATURE INDICATOR – REMOVAL/INSTALLATION
1. General
A. This procedure contains the removal and installation tasks for the exhaust gas temperature (EGT) indicator. The EGT indicator is installed in the P5 forward overhead panel.
2. Exhaust Gas Temperature Indicator Removal (Fig. 401)
A. Procedure
(1)
Set the switch and the circuit breaker:
(a)
Set the APU master switch on the P5 forward overhead panel to the OFF position and attach a DO-NOT-OPERATE tag.
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