3.  Section 48 Access and Blowout Door Test
A.  Test Section 48 Access and Blowout Door
(1)  
Apply a force of 52 to 75 pounds to outstanding flange of channel as shown in Fig. 501. Load shall be distributed over a bearing area of one square inch minimum at centerline of door. The latch shall completely release and door shall open within applied load range.

(2)  
If load range of 52 to 75 pounds cannot be obtained, adjust door per par. 2.

Section 48 Access and Blowout Door Adjustment/Test  500 
52-49-11  Figure 501  Oct 20/83 
Page 502

BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

PRESSURE FUELING STATION ACCESS DOOR – ADJUSTMENT
1. General
A.  The pressure fueling station access door is located in the lower leading edge of the right wing. (Refer to Servicing, Door 6540, Chapter 12.)
2.  Pressure Fueling Station Access Door Adjustment
A.  Adjust Pressure Fueling Station Access Door
(1)  Adjust door latches.
(a)  
At latch being adjusted, press door to its fit and fair position at door edge as shown in figure 501.

(b)  
Lock latch and check that preload exists by depressing latch bolt at location indicated in figure 501. There must be 0.005 to 0.020 inch depression free play at this point.

(c)  
If free play required in step (b) is not obtained, add or subtract shims as shown in figure 501.

CAUTION:  WHEN DOOR IS UNLATCHED IT SHOULD FREE FALL OPEN 1.00 INCH MINIMUM.

500  Pressure Fueling Station Access Door Latch Free Play 
May 15/67  Figure 501  52-49-21 
Page 501

BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

TIRE BURST PROTECTOR SCREEN DOORS - MAINTENANCE PRACTICES
EFFECTIVITY
Airplanes with Tire Burst Screens
1.  General
A.  The maintenance practices included in this section (201 to 299 page block) are general maintenance instructions that do not definitely fall within a specific category. Other maintenance practices such as Removal/Installation, Adjustment/Test, etc., are provided in the applicable page blocks.
B.  A tire burst protector screen door is located in each main landing gear wheel well. When opened, each door hinges outboard to provide access to components located on the main gear wheel well forward bulkhead. The two doors are similar and are included in the door warning system (Ref 52-71-0, Door Warning System). The door installations are not identical, however, the following procedure is applicable to either door.
2.  Tire Burst Protector Screen Doors Opening and Closing Procedure
A.  Open Tire Burst Protector Screen Door
(1)  
Remove safety pin from latch fitting and guide on door frame and protector screen  (Fig. 201). The pin is located at approximately the vertical midpoint on the door frame above the handles and is attached to a safety chain.

(2)  
Rotate spring safety latch, located on door lower frame at end of upper handle, and release the upper handle from closed and latched position.

(3)  
Rotate upper handle away from the door and pull the handle downward. This removes the lower latch pin from engagement in the latch fittings on door frame and support structure.

(4)  
Push up on the lower handle and disengage the upper latch pin from latch fittings on door frame and support structure.

NOTE:  As the latch pin is pushed up to disengaged position, the proximity sensor will actuate the door warning system and the appropriate door warning light on the P5-20 Door Warning Module will illuminate indicating the door is unlatched. The door warning light will be illuminated until the door is again latched.
5C1
Jun 20/86 52-49-31 Page 201
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

(5) Open the tire burst protector screen door, which hinges outboard from the bulkhead.
CAUTION:  TO PRECLUDE THE LEFT LATCH PIN AND SAFETY CHAIN FROM INTERFERING WITH THE AILERON CONTROL CABLE, REINSTALL THE PIN IN THE GUIDE.
B.  Close Tire Burst Protector Screen Door
(1)  
Remove latch pin from guide if installed.

(2)  
Close the door then pull down on the lower handle. (See figure 201.) Make sure the upper latch pin is properly inserted in the latch fittings on door frame and support structure.

(3)  
Push the upper handle upward and rotate the handle toward the door. Make sure the lower latch pin is properly inserted in the latch fittings on door frame and support structure.

(4)  
Secure the upper handle in closed and latched position with the spring safety latch.
　
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