(2)
AIPC 26-14-10, Fig. 1
(3)
AIPC 26-19-00, Fig. 1
(4)
WDM 49-52-21
(5)
SSM 49-52-02
B. Access
(1)
Location Zone
137 Body Landing Gear Well L.H.
142 Aft Cargo Container Compartment, LH
145 Bulk Cargo Compartment, LH
311 Area Aft of Pressure Bulkhead, LH
313 Stabilizer Torsion Box Compartment, LH
(2)
Access Panel 193J Keel Beam Access Panel 312AR Horizontal Stabilizer Jackscrew Access Door 731 Door - Wing Landing Gear - Center Section Inboard Left 751 Door - Body Landing Gear - Aft Inboard Left 752 Door - Body Landing Gear - Aft Outboard Left
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A
747-400
MAINTENANCE MANUAL
ASEE AFT LOWER CARGO COMPARTMENT
BSEE COMPARTMENT BULK CARGO
APU BLEED AIR DUCT SEE C
FWD THERMAL SWITCH
SIDEWALL (TYP) LINING PANEL VERTICAL LINING PANEL (TYP) SLOPING SIDEWALL DOORWAY CARGO (REF)
A
BULKHEAD LINING PANEL 2160 STA PANEL (TYP) ENCLOSURE LINING VACUUM WASTE TANK
1920 STA
FWD DOORWAY (REF) BULK CARGO B OPENING 312A ACCESS VERTICAL SIDEWALL LINING PANEL (TYP) SLOPING SIDEWALL LINING PANEL FLOOR (REF) BULK COMPARTMENT (TYP) C FWD
Figure 401 (Sheet 1) Thermal Switch Installation
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A
747-400
MAINTENANCE MANUAL
STA 1248
STA 1480
-APU DUCT APUTHERMAL SWITCH
Thermal Switch Installation
Figure 401 (Sheet 2)
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747-400 MAINTENANCE MANUAL
C. Procedure
S 864-002
(1)
Open the circuit breaker, APU DUCT OVERHEAT, on the P83 panel and attach a DO-NOT-CLOSE tag.
S 014-003
(2)
For thermal switches S969 thru S983 installed in the aft cargo compartment, remove the left vertical side wall panel in the aft and bulk cargo compartment. Thermal switches S978 and S983 are more easily accessible from the main deck. Remove the main deck floor panels directly above them for accesss.
NOTE: The thermal switches are installed on the airplane frame
____
along the APU air duct.
S 014-004
(3) For thermal switches S1173, S1924, S984, S985, and S986 installed in the aft of the bulk cargo compartment, get access to the thermal switches through the access door, 312A, installed in the area aft of the pressure bulkhead.
NOTE: The thermal switches are installed on the airplane frame
____
along the APU air duct.
S 014-035
(4) ALL AIRPLANES; Remove the applicable access panels in the main wheel well for the seven thermal switches.
~....................................
| THERMAL SWITCH | ACCESS PANEL |
......................................
| S2207 | None |
......................................
| S2208 | 193J |
......................................
| S2209 | 731 |
......................................
| S2210 | 751 |
......................................
| S2211 | 751 |
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