(b)  
Precise Tool NG2.0625-16 PTG THREADSNAP, used to examine the pitch diameter of the axle thread with original configuration.

(2)  
Micrometer of appropriate size and accuracy, used to measure the major diameter of the axle thread.

(3)  
Axle Nut NO-GO Gage Tool for minor diameter.

(a)  
Plug Gage, Landing Gear Nut, F80198-14, used to examine the minor diameter of the axle nut with original configuration or equivalent vendor tool Class X, 1.9949 Go/2.0034 No-Go with handle.

(b)  
Plug Gage, Landing Gear Nut, F80198-15, used to examine the minor diameter of the axle nut with undersized configuration or equivalent vendor tool Class X, 1.9391 Go/1.9477 No-Go with handle.

(4)  
Axle Nut NO-GO Gage Tool for pitch diameter.

(a)  
NO-GO Gage, 2-1/16-16 UNS 3B No-Go member only with handle, pitch diameter 2.0272, used to examine the pitch diameter of the axle nut with original configuration.

(b)  
NO-GO Gage, 2-16 UNS 3B No-Go member only with handle, pitch diameter 1.9647, used to examine the pitch diameter of the axle nut with undersized configuration.

(5)
CHF/PD -- Axle external thread gage tool, Johnson Gage Co., Inc. (V74979)(Optional)

NOTE:  All the NO-GO gage tools, except for the F80198-XX, can be purchased from PRECISE TOOL and GAGE CO. INC., 13300 S.E. 30th St., Suite #201, Bellevue, WA 98005 USA, Tel. No. (206) 746-1234/623-1120, Fax No. (206) 747-8131.
B.  Do a check on the nose gear axle thread and axle nut wear limits (Fig. 601).
CAUTION:  ON AIRPLANES WITH REWORKED AXLES, MAKE SURE THERE IS A MARKING WHICH READS "CAUTION - SPECIAL AXLE NUT REQUIRED" ALONG THE UPPER OUTER ENDS OF THE AXLE SLEEVE. THE MARKING WILL CONSIST OF BLACK LETTERS ON A YELLOW BACKGROUND. IF MARKING IS NOT ON THE AXLE, THE INCORRECT AXLE NUT MAY BE INSTALLED. IF THE INCORRECT AXLE NUT IS INSTALLED, THE WHEEL MAY FALL OFF DURING TAKEOFF OR LANDING.
500 
Feb 01/95  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  32-21-71 Page 601 

Nose Gear Axle Wear Limits  500 
32-21-71 Page 602  Figure 601 (Sheet 1) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Oct 20/91 

500  Nose Gear Axle Wear Limits 
Jun 20/93  Figure 601 (Sheet 2) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  32-21-71 Page 603 

NOSE GEAR DOORS - DESCRIPTION AND OPERATION
1. General
A.  The nose gear doors are clamshell type, and consist of two doors that fair with the fuselage contour when closed. (See figure 1.) The doors close over the nose wheel well in the lower nose section of the fuselage when the gear is retracted and open when the gear is extended. They remain open at all times when the nose gear is in the down position. Refer to 32-33-0 for information on nose gear door retraction.
2.  Nose Wheel Well Doors
A.  The nose wheel well doors are of glass fabric reinforced epoxy laminate faced honeycomb construction. Three hinge arms extend to the side of each door to engage hinges at the outer edges of the wheel well. The lower end of a door actuation rod is connected to a raised lug on the middle hinge of each door. A link and crank assembly connected to an arm protruding from the upper drag brace work with the door actuation rods to open and close the doors for extension and retraction.

500  Nose Wheel Well Doors 
Jun 20/85  Figure 1 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  32-22-0 Page 1 

NOSE GEAR WHEEL WELL DOORS - REMOVAL/INSTALLATION
1.  Equipment and Materials
A.  Ground Lock Assemblies (Ref 32-00-01)
B.  Tail Support Jack
C.  Spring Scale - 0-100 pounds capacity
D.  Aluminum oxide closed coat cloth, 180 grit, Federal Specification P-C-451 or Garnet closed coat abrasive paper, 180 grit, Federal Specification P-P-121 (Ref 10-30-51)
E.  Epoxy Primer - BMS 10-11, Type I (Ref 20-30-41)
F.  Epoxy Enamel - BMS 10-11, Type II, Color BAC702 white (Ref 20-30-41)
2.  Remove Wheel Well Doors (Fig. 401).
A.  Install ground lock assemblies in nose and each main landing gear (Ref 32-00-01).
B.  Jack airplane nose until nose wheel clears. Lower tail support jack as nose is raised (Ref Chapter 7, Jacking).
C.  Detach door operator rod (1) from door center hinge (4) by removing bolt (5).
D.  Detach bonding jumper (19) from forward and aft door hinges (13).
E.  Support door and remove bolts (18, 6, 18) from forward (13), center (4), and aft (13), hinges respectively.
　
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