NOTE: Measure all forces from tip of handle perpendicular to control lever arm.
(4)
Measure maximum force required to move handle from unlatched to emergency position. The maximum force shall occur at the unlatched position and be 60 (+ 10) pounds.
(5)
Measure the maximum force required to move the handle from emergency to unlatched position. The force shall be 15 (+ 5 ) pounds.
(6)
Measure the maximum force required to move the handle from unlatched to the latched position. The force shall be 15 (+ 5) pounds and occur at the unlatched position.
(7)
Remove handle and reconnect exterior control telescopic unit, control rods and radius rod. Refer to Aft Airstair Control Console Removal/Installation.
500
52-14-11 Page 504 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. May 15/69
AFT AIRSTAIR EMERGENCY EXTENSION MECHANISM - MAINTENANCE PRACTICES
EFFECTIVITY
Airplanes With Aft Airstair
1. General
A. The maintenance practices included in this section (201-299 page block) are general maintenance instructions that do not definitely fall within a specific category. Other maintenance practices such as Servicing, Removal/Installation, Adjustment/Test, etc. are provided in the applicable page blocks.
2. Emergency Extension Mechanism Arming
A. General
(1) Arming emergency extension mechanism will be required only after emergency operation of airstair and adjustment of emergency extension mechanism (Ref Aft Airstair Emergency Extension Mechanism - Adjustment/Test).
B. Arm Emergency Extension Mechanism
(1)
Extend airstair using emergency operation.
(2)
Rotate roller arm to SET position (Fig. 201).
NOTE: Pull out on spring behind roller arm to release tension on arm and cam.
(3)
Retract the airstair.
(4)
Manually or electrically extend airstair.
(5)
Rotate the roller arm to the NORM position.
(6)
Retract airstair. Emergency extension mechanism is armed.
Feb 15/79 52-14-21 Page 201
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Emergency Extension Mechanism - Maintenance Practices 500
52-14-21 Figure 201 Feb 15/69
Page 202
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
AFT AIRSTAIR DRIVE EMERGENCY EXTENSION LATCH AND
LOCKOUT MECHANISM - REMOVAL/INSTALLATION
EFFECTIVITY
Airplanes With Aft Airstair
1. General
A. The aft airstair emergency extension mechanism consists of an assembly of cams, links, cranks and springs arranged to control a latch and lockout mechanism which in turn controls the energy stored in a torsion bar. The stored energy of the torsion bar is used to initiate the emergency extension of the aft airstair. The mechanism is located below and aft of the hinge support fitting of the aft airstair door (Fig. 401).
B. Removal of the emergency extension latch and lockout mechanism consists of disconnecting and removing the various mechanism components until the mechanism is completely removed. The following procedures are written assuming the complete mechanism is to be removed. However, all steps do not necessarily need to be accomplished if only a portion of the mechanism requires removal. The complete procedure should be read with only those steps required for partial removal and installation performed.
2. Equipment and Materials
A. Grease - MIL-G-21164A
B. Corrosion-Preventive Compound - MIL-C-11796, Class 3
3. 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.
CAUTION: DO NOT EXTEND AIRSTAIR MORE THAN 132 INCHES DURING EMERGENCY OPERATION AS SECONDARY STRUCTURE MAY BE DAMAGED.
Feb 15/79 52-14-21 Page 401
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Aft Airstair Drive Emergency Extension Latch and Lockout Mechanism 500
52-14-21 Figure 401 (Sheet 1) May 15/71
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
500 Aft Airstair Drive Emergency Extension Latch and Lockout Mechanism
Nov 15/72 Figure 401 (Sheet 2) 52-14-21
Page 403
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
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