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HEAT SHIELD
APU
SHROUD
FWD DETECTOR
BONDING SEE D
JUMPER TURBINE
EXHAUST
PORT
APU EXHAUST COMPARTMENT
SEE E A
A 737-300/400/500MAINTENANCE MANUAL
APU Fire Detector Installation
Figure 401 (Sheet 2)
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A 737-300/400/500MAINTENANCE MANUAL
(EXAMPLE)
APU Fire Detector Installation
Figure 401 (Sheet 3)
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A
737-300/400/500MAINTENANCE MANUAL
E. Remove an APU Fire Detector Element
S 344-016
(1)
Remove the lockwire from the connectors.
S 344-017
(2)
Remove the electrical connectors from the element.
S 414-018
(3)
Install protective caps on the element and the connector.
S 014-019
(4)
Remove the jamnuts from the element fittings.
S 014-020
(5)
Release the clamps along the length of the element.
NOTE:____Hold the element. Do not bend the element.
S 014-087
(6)
Slide the element out of the brackets and remove it.
S 414-021
(7)
Replace the jamnuts on the element fittings.
S 014-022
(8)
Install protective caps on the element fittings.
F. Remove an Exhaust Detector Element
S 014-025
(1)
Remove the lockwire from the connectors.
S 034-026
(2)
Disconnect the cable from the detector fittings.
S 434-027
(3)
Install protective caps on the element and the connector.
(4)
Disconnect the connector on the exhaust overheat detector.
(5)
Install protective caps on the connector.
S 034-028
S 434-029
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737-300/400/500MAINTENANCE MANUAL
S 924-030
(6)
Tape the detector cable and connector to the heat shield and muffler assembly.
S 014-031
(7)
Open the 3802 tail cone access door.
S 014-033
(8)
Remove four bolts attaching drip pan and remove the drip pan.
S 014-074
CAUTION: DO NOT BEND OR NICK THE DETECTORS WHEN THE APU AFT FAIRING IS
_______ PULLED FROM THE AIRPLANE. DAMAGE TO THE DETECTOR MAY OCCUR.
(9)
Remove APU aft fairing (AMM 49-81-31/401).
S 034-072
(10)
Remove an exhaust overheat sensing element as follows:
(a)
Remove lockwire from connectors and disconnect cable.
(b)
Remove the jamnuts from the element fittings.
(c)
Release the clamps along the length of the element.
NOTE:____Hold the element. Do not bend the element.
(d)
Slide the element fittings away from the bracket and remove the element.
