(5)
Move control handle to emergency extend position and check that adjustable latch (10) does not move and readjust if required.
(6)
Rearm the emergency extension mechanism.
(7)
Fully extend airstair using normal operation.
(8)
Move control handle to emergency position. Adjustable latch (10) should not move to release torsion bar.
500
Jan 15/71 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 52-14-21 Page 505
AFT AIRSTAIR DRIVE EMERGENCY EXTENSION LATCH AND
LOCKOUT MECHANISM - INSPECTION/CHECK
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 Drive Emergency Extension Latch and Lockout Mechanism -Wear Limits
501 Emergency Extension Mechanism Wear Limits
Nov 01/73 Figure 601 (Sheet 1) 52-14-21
Page 601
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Emergency Extension Mechanism Wear Limits 500
52-14-21 Figure 601 (Sheet 2) Nov 1/73
Page 602
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
500 Emergency Extension Mechanism Wear Limits
Nov 1/73 Figure 601 (Sheet 3) 52-14-21
Page 603
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Emergency Extension Mechanism Wear Limits 500
52-14-21 Figure 601 (Sheet 4) Nov 1/73
Page 604
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
500 Emergency Extension Mechanism Wear Limits
Nov 1/73 Figure 601 (Sheet 5) 52-14-21
Page 605
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Emergency Extension Mechanism Wear Limit 500
52-14-21 Figure 601 (Sheet 6) Nov 1/73
Page 606
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
500 Emergency Extension Mechanism Wear Limits
Nov 1/73 Figure 601 (Sheet 7) 52-14-21
Page 607
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Emergency Extension Mechanism Wear Limits 500
52-14-21 Figure 601 (Sheet 8) Nov 1/73
Page 608
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
500 Emergency Extension Mechanism Wear Limits
Nov 1/73 Figure 601 (Sheet 9) 52-14-21
Page 609
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
EMERGENCY EXTENSION TORSION BAR - REMOVAL/INSTALLATION
EFFECTIVITY
Airplanes With Aft Airstair
1. Prepare for Removal
A. Open aft airstair circuit breakers (2 places) on P6 panel.
B. Extend aft airstair using emergency mode.
WARNING: BEFORE REMOVING MOUNTING BOLTS, AIRSTAIR MUST BE EXTENDED USING THE EMERGENCY MODE TO RELIEVE ALL STORED ENERGY IN THE TORSION BAR.
C. Remove section of floor panel inboard of aft airstair door opening.
2. Remove Torsion Bar
A. If same torsion bar is to be reinstalled, check torsion bar installation for wear prior to removal by checking backlash at splined couplings (Ref 52-14-21, Inspection/Check).
B. Remove bolts securing forward support bracket for torsion bar (Fig. 401).
C. Remove aft end of torsion bar from actuating arm support and remove bar from airplane.
3. Install Torsion Bar
A. Engage torsion bar with actuating arm support (Fig. 401).
B. Set lower end of actuating arm 4.80 +0.10/-0.10 inches outboard from latch pivot.
C. Align forward support bracket to torsion bar and engage bar.
D. Install support bracket mounting bolts and check that 4.80 dimension is maintained.
E. Close aft airstair circuit breakers (2 places) on P6 panel.
F. Arm the emergency extension system (Ref 52-14-21, Emergency Extension Mechanism).
G. Extend airstair using emergency mode and check that torsion bar rotates airstair to the free fall position.
H. Rearm the emergency extension system.
I. Install floor panel.
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