Description and Operation
Actuator
Airstair Door Assembly
Carriage
Carriage Tracks
Door Latch and Control
Door Tracks
Electrical System
Removal/Installation
Forward Airstair Door Carriage................................................................................ *[4] 52-61-511 Removal/Installation
Forward Airstair Door Actuator ................................................................................ *[4] 52-61-521 Removal/Installation
Forward Airstair Door Lock Mechanism................................................................... *[4] 52-61-531 Removal/Installation Adjustment/Test
Forward Airstair Door Actuator Snubber.................................................................. *[4] 52-61-541 Removal/Installation
Forward Airstair Door Normal System motor........................................................... *[4] 52-61-581 Removal/Installation
Forward Airstair Door Standby System motor ......................................................... *[4] 52-61-591 Removal/Installation Subject Subject No.
5C8
Jun 20/86 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Contents 52 Page 9
Forward Airstair Door Closed Limit Switches .......................................................... *[4] 52-61-601 Removal/Installation Adjustment/Test
Forward Airstair Door Open Limit Switches............................................................. *[4] 52-61-611 Removal/Installation Adjustment/Test
DOOR WARNING
DOOR WARNING SYSTEM ....................................................................................... 52-71-0 Description and Operation Trouble Shooting Adjustment/Test
Miscellaneous Switching Module............................................................................. 52-71-31 Removal/Installation Adjustment/Test
*[1] Airplanes without aft airstairs *[2] Airplanes with aft airstairs *[3] Passenger/Cargo Convertible Airplanes *[4] Standard Passenger Airplanes *[5] Airplanes with Tire Burst Screens
5C8
Contents 52 Page 10 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Jun 20/91
DOORS - DESCRIPTION AND OPERATION
1. General
A. The doors are removable units which enclose various compartments of the airplane and which permit entry to or exit from those compartments by passengers, crew or maintenance personnel. The doors are divided for their specific purpose into the following groups:
Passenger/Crew Doors Emergency Exits Cargo Doors Service Doors Fixed Interior Doors
B. Included in this chapter is the forward airstair, which is installed on the airplane to provide access from the ground through the forward entry door. The forward airstair is installed under the floor at the forward entry door. The door can be opened and closed without extending or retracting the airstair.
C. An electrical door warning system is provided to indicate to the flight crew that all doors are closed and properly latched before flight.
D. This chapter also includes a description of the main landing gear doors, which consist of small door segments attached to the main gear shock strut, and the nose landing gear doors which are single clamshell doors that are slaved to the nose gear drag brace.
E. All doors are fitted with extruded rubber seals to prevent air pressurization loss or improve airflow over exterior joining surfaces.
F. If a door is removed or stowed open for a prolonged period during inclement weather a protective cover should be installed to prevent damage to the airplane interior. Refer to Illustrated Tool and Equipment List for available covers.
G. Passenger/Crew and cargo doors may be opened and closed in winds up to 40 knots or left latched open in winds up to 65 knots without structural damage.
2. Passenger/Crew Doors
A. Forward Entry Doors
(1) The forward entry door is on the left forward side of the airplane (Fig. 1). It is an inward-outward opening plug type door, which can be operated from inside or outside the airplane.
B. Aft Entry Door
(1) The aft entry door is on the left aft side of the airplane (Fig. 1). It is an inward-outward opening plug type door similar to the forward entry door, though slightly smaller, and can be operated from inside or outside the airplane.
500
Feb 20/87 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 52-00 Page 1
Door Locations 5C1
52-00 Page 2 Figure 1 (Sheet 1) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Jun 20/86
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