Aft Airstair AC Power Unit Installation 500
52-14-51Page 402 Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Feb 15/68
AFT ENTRY DOOR AND AIRSTAIR CENTRIFUGAL GOVERNOR - REMOVAL/INSTALLATION
EFFECTIVITY
AIRPLANES WITH AFT AIRSTAIR
1. Prepare for Removal
A. Open aft airstair circuit breakers (2 places) on P6 panel.
B. To gain access to governor, enter lower cargo compartment and remove access panels at aft end of compartment.
2. Remove Centrifugal Governor
A. Remove bolts attaching governor to gearbox (Fig. 401).
B. Disengage governor from gearbox and remove governor.
CAUTION: PLACARD AIRSTAIR CONTROLS. DO NOT OPERATE WITHOUT GROUND SUPPORT. CENTRIFUGAL GOVERNOR IS REMOVED.
3. Install Centrifugal Governor
A. Align index pin on governor with hole on gearbox mating flange and engage splined shaft with gearbox (Fig. 401).
B. Install governor mounting bolts.
C. Close aft airstair circuit breaker s (2 places) on P6 panel.
D. Perform the centrifugal governor test (Ref Aft Entry Door and Airstair Centrifugal Governor -Adjustment/Test).
E. Extend airstair using emergency mode . Check that the airstair extends within 20 seconds.
F. Install access panels in lower cargo compartment.
G. Rearm emergency extension system (Ref 52-14-21, Emergency Extension Mechanism).
Nov 15/79 52-14-61 Page 401
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Aft Airstair Centrifugal Governor Installation 500
52-14-61 Figure 401 Feb 15/68
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
AFT ENTRY DOOR AND AIRSTAIR GEARBOX - REMOVAL/INSTALLATION
EFFECTIVITY
Airplanes With Aft Airstair
1. General
A. The aft entry door and airstair gearbox installations are similar. Therefore, only one procedure is given. Differences in removal and installation between the forward and aft units are given in the procedure.
2. Equipment and Materials
A. Grease - MIL -G-21164A
3. Prepare for Removal
A. Open aft airstair circuit breaker on P6 panel.
B. Extend airstair using emergency mode.
C. If aft gearbox is being replaced, remove control console shroud.
D. Remove cover over transmission unit.
4. Remove Gearbox
A. If forward gearbox is being replaced , remove ac power unit (Ref 52-14-51).
B. If aft gearbox is being replaced, remove centrifugal governor (Ref 52-14-61).
C. Remove bolts attaching gearbox to transmission unit (Fig. 401).
D. Disengage gearbox from splined shaft of transmission unit and from gearbox transfer shaft and remove gearbox.
5. Install Gearbox
A. Check for allowable wear at transfer shaft to gearbox coupling (Ref 52-14-71).
B. Butter lubricate spline of gearbox transfer shaft with grease. Engage gearbox with splined shaft of transmission unit and with gearbox transfer shaft (Fig. 401).
NOTE: Do not lubricate splined shaft which mates with transmission unit.
Feb 15/79 52-14-71 Page 401
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Aft Airstair Gearbox Installation 500
52-14-71Page 402 Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Feb 15/68
C. Install bolts attaching gearbox to transmission unit.
D. If forward gearbox is being replaced, install ac power unit (Ref 52-14-51, R/I).
E. If aft gearbox is being replaced, install centrifugal governor (Ref 52-14-61, R/I).
F. Install cover over transmission unit.
G. If aft gearbox is being replaced, install control console shroud.
H. Arm emergency extension system (Ref 52-14-21).
500
Oct 20/83 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 52-14-71 Page 403
AFT ENTRY DOOR AND AIRSTAIR GEARBOX - INSPECTION/CHECK
EFFECTIVITY
Airplanes With Aft Airstair
1. General
A. The data consists of illustrations and wear limits charts. No procedure is given in this section for gaining access to permit inspection. For this information, refer to Aft Airstair Drive Emergency Extension Latch and Lockout Mechanism - Removal/Installation.
2. Aft Airstair Gearbox and Transfer Shaft Wear Limits
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