LOWER NOSE COMPARTMENT ACCESS DOOR - DESCRIPTION AND OPERATION
1. General
A. The lower nose compartment access door is an inward opening plug type door, which is operated from outside the airplane, and is situated forward of the nose wheel well. (See figure 1.) The door is included in the door warning system, sharing a common warning light in the control cabin with the equipment compartment external access door.
B. The door is of alclad frame and skin construction. Two hinge arms extend aft from the door structure to engage hinge fittings on the forward face of the nose wheel well forward bulkhead. Around the periphery of the door a continuous seal prevents loss of cabin air when the airplane is in flight. Pressurization loads on the door are transmitted to the fuselage by four stop pads on the edge of the door, which bear against equivalent pads attached to the fuselage structure surrounding the door.
2. Latching Mechanism
A. The door latching mechanism consists of an operating shaft connected to a latch pin which protrudes through the forward edge of the door to engage with a hole in the surrounding structure. The operating shaft has an outside handle which is recessed flush with the exterior skin. (See figure 1.)
3. Operation
A. The door is opened from outside the airplane by pushing the trigger in the door handle, which allows the handle to spring out from its flush position so that it may be easily grasped, and then rotating the handle counterclockwise. This action withdraws the latch plunger, energizes the door warning light in the control cabin, and allows the door to be hinged upward. As soon as the door has moved clear of its opening the handle may be rotated clockwise and pushed back into its recess in the exterior skin of the door.
B. When the door is closed the handle must be returned to its open position before the door will seat in its opening. The door is latched shut by a final clockwise rotation of the handle which pushes the latch plunger into the structure forward of the door and opens the door warning switch. When the door is thus closed and latched, the handle is then pushed back into its recess.
500
May 15/67 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 52-48-31 Page 1
Lower Nose Compartment Access Door 500
52-48-31 Figure 1 May 15/68
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
LOWER NOSE COMPARTMENT ACCESS DOOR - REMOVAL/INSTALLATION
1. General
A. If the lower nose compartment access door is removed and reinstalled on the same airplane without any disturbance to its adjustments, it may be accomplished in accordance with par. 4 by performing only steps A, B, G and H.
B. If the door to be installed is a new unit , it must be accomplished in accordance with par. 4 by performing all steps.
2. Equipment and Materials
A. Shim - 0.050 inch
3. Remove Lower Nose Compartment Access Door
A. Open door and place in full open position.
B. Remove bolt (10, Fig. 401, Detail A), washer, nut, and spacer (9) from each door hinge arm (2) and serrated hinge (1).
C. Slide door out of airplane through door access hole.
4. Install Lower Nose Compartment Access Door
A. Check door seals for condition. If required, repair per 52-09-100, Approved Repairs.
B. From inside airplane, place door in mounting position and install spacer (9, Fig. 401, Detail A), bolt (10), washer and nut through each hinge arm (2) and serrated hinge (1). Tighten bolt.
NOTE: Tighten bolt finger-tight only if door is to be adjusted.
C. Adjust doorstops (4) so that door is recessed -0.03 to -0.09 inch in from fuselage exterior profile. This tolerance is for an unpressurized condition.
NOTE: All doorstop pads must rest on respective frame stops. Serrations on frame stops must be properly seated.
You can increase the limits by 0.03 inch in one or more locations to make the door recessed 0.00 to -0.12 inch. The sum of the lengths of the increased limits must not be more than 4.2 inches.
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Feb 20/91 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 52-48-31 Page 401
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