NOTE: Generator mounting holes are slotted to permit generator removal with nuts left on studs. Nuts must be backed off about 1/2 inch to permit rotation of generator frame without interference from nuts. It may be necessary to tap generator with rubber mallet to permit rotation.
(2)
Support generator.
(3)
Rotate generator frame counterclockwise, viewed from free end, until studs line up with flange openings, move straight away from APU turbine until studs clear generator flange.
501
Jun 20/86 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 24-21-21 Page 401
EFFECTIVITY
AIRPLANES AFTER
INCORPORATION OF
SB 24-1076
AC APU Generator Installation 503
24-21-21 Figure 401 (Sheet 1) Feb 20/90
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
EFFECTIVITY
AIRPLANES AFTER
INCORPORATION OF
SB 24-1076
503 AC APU Generator Installation
Feb 20/90 Figure 401 (Sheet 2) 24-21-21
Page 402A/402B
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
H21311
503 AC APU Generator Installation
Feb 20/90 Figure 401 (Sheet 3) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 24-21-21 Page 403
4. Install APU AC Generator (Fig. 401)
A. Install ac generator.
(1)
Loosen nuts on APU turbine studs leaving a gap of approximately 1/2 inch between APU turbine flange and underside of the nuts. Lubricate generator spline with approximately 1/2 cubic inch of anti-fretting compound.
(2)
Place generator into position on support so that generator flange holes and studs on APU turbine align. Position generator so that terminal blocks are on left side when generator is viewed from free end and ground bus bar angle will be vertical.
(3)
Mate generator and APU turbine splines and slide generator slotted holes over turbine flange studs keeping holes and studs in alignment.
CAUTION: AVOID ROUGH HANDLING WHEN MATING MALE AND FEMALE SPLINES. SERIOUS DAMAGE MAY RESULT FROM GENERATOR STRIKING TURBINE.
(4)
With generator flange in position against turbine flange, rotate generator clockwise (as seen from free end) so that stud shanks fully penetrate slots in generator mounting flange.
(5)
Tighten generator mounting stud nuts from 160 to 190 pound-inches.
B. Install current transformer mount, current transformer and ground bus bar angle as one assembly with wires attached.
C. Install ac generator cooling air inlet duct.
D. Install all wires on generator and exciter terminals. Remove all tags attached in step 3.F. above.
(1) Check that each wire and terminal build-up is exactly as it was prior to removal.
NOTE: Install the red lead to terminal F to match the short yellow exciter lead. Install the grey lead to terminal A to match the short black exciter lead.
E. Install ac generator and exciter terminal covers.
F. Raise the APU into its normal operating position and complete al1 connections and
attachments (Ref 49-11-0 R/I) or install APU lower shroud (Ref 49-11-0 R/I).
G. Test ac APU generator (Ref 24-21-0).
501
24-21-21 Page 404 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Jun 20/86
AC GENERATOR SPLINE ADAPTER AND SPINDLE - REMOVAL/INSTALLATION
1. General
A. The spline adapter used to drive the generator consists of 14 parts, seven of which are used with the spline adapter and the other seven with the generator spindle. It is recommended that both the spline adapter and the mating generator spindle be replaced when the thickness of the worn spline teeth is about one half that of the teeth on a new part. To gain access to the generator spindle, the drive-end bearing must be removed, which requires a mechanical puller. An arbor press will be required for the installation of the generator bearings.
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