FORWARD AIRSTAIR DOOR - REMOVAL/INSTALLATION
EFFECTIVITY
Standard Passenger Airplanes
1. General
A. The forward entry door should be open during removal or installation of the forward airstair door, to ensure that the airstair door latch pin is retracted.
B. If the airstair door is removed and reinstalled on the same airplane without any disturbance to its adjustments, it may be installed as described in par. 3 of the following procedures.
C. If the airstair door to be installed is a new unit, it must first be prepared as described in par. 4.
D. Installation of a prepared new door, or one which has previously been installed on another airplane, should be accomplished as described in par. 5.
E. The door adjustments described in par. 5 are designed to satisfy three conditions as follows:
(1)
Door must be adjusted so that the outside skin is within the allowable tolerances of flushness relative to the exterior fuselage skin around perimeter of door opening.
(2)
Door must be adjusted horizontally and vertically within the door opening to ensure the two following conditions:
(a)
That each of the eight door stop pins contact the center of the eight matching bearing plates on door opening.
(b)
That the gap between the edges of door outer skin and the door opening is within allowable tolerances
NOTE: "Horizontal" adjustment is in a forward or aft direction within the airstair door opening. "Vertical" adjustment is in a vertical direction when looking normal to the plane of door opening.
(3) The relationship between the door and the door carriage mechanism must be adjusted so that door will travel smoothly into and out of its properly centered closed position.
2. Equipment and Materials
A. Organic Corrosion Inhibiting Compound -BMS 3-23 (Ref. 20-30-21)
5C8
Feb 20/84 52-61-500 Page 401
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
3. Remove Forward Airstair Door
A. Deleted
B. Fully open airstair door and open the following circuit breakers on circuit breaker panel P6:
(1)
FORWARD AIRSTAIR CONTROL
(2)
FORWARD AIRSTAIR DOOR
(3)
FORWARD AIRSTAIR ACTUATOR
(4)
FORWARD AIRSTAIR STANDBY CONTROL
(5)
FORWARD AIRSTAIR STANDBY
C. Remove bolt securing lower guide fitting of door to carriage (Fig. 401).
D. Lift door clear of carriage and disengage upper guide rollers from lower ends of door tracks.
NOTE: An access panel, in web which supports aft door track, may be removed if necessary to provide additional clearance to rotate door.
E. Rotate door so that it may be removed from airplane through airstair door cutout.
4. Install Forward Airstair Door (Existing Unit)
A. Check door seals for condition. If required, repair per 52-09-100, Approved Repairs.
B. Apply organic corrosion inhibiting compound to exposed areas of door interior structure (access through lightening holes) per instructions in 51-21-91.
C. With airstair removed and door carriage in door open position, insert airstair door through cutout in body skin.
D. Rotate door and engage rollers on upper guide fittings in lower ends of door tracks (Fig. 401).
NOTE: An access panel, in web which supports aft door track, may be removed if necessary to provide additional clearance to rotate door.
E. Install bolt, washers, and nut connecting door carriage to lower guide fitting.
501
52-61-500 Page 402 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Aug 15/80
500 Forward Airstair Door Installation
Nov 15/68 Figure 401 (Sheet 1) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 52-61-500 Page 403
Forward Airstair Door Installation 500
52-61-500 Page 404 Figure 401 (Sheet 2) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Nov 15/68
500 Forward Airstair Door Installation
Nov 15/68 Figure 401 (Sheet 3) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 52-61-500 Page 405
F. Deleted
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