Starter Motor Installation 500
49-41-11Page 402 Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Jun 20/83
D. Install starter motor attaching washers and nuts. Tighten nuts to a torque range of 70 to 90 pound-inches.
E. Connect the electrical leads to the applicable starter motor terminals:
(1)
Remove the tags from the starter motor terminals and the electrical leads.
(2)
Put the electrical leads on the applicable starter motor terminals.
(3)
Install the nuts on the starter motor terminals.
(4)
Tighten the nuts on the starter motor terminals to 75 pound-inches (8.5 newton-meters).
CAUTION: DO NOT CROSS ELECTRICAL LEADS. LEADS MUST BE CONNECTED TO CORRESPONDING STARTER MOTOR TERMINALS TO PREVENT DAMAGE TO APU COMPONENTS WHEN APU START IS ATTEMPTED.
NOTE: If starter motor was replaced due to clutch failure, inspect oil filter element prior to oil pump replacement (AMM 49-91-11, oil Pump - Inspection/Check).
F. Close the circuit breaker on M280 module-APU accessory unit on E3- electronic shelf.
G. Position BATTERY SWITCH to ON and remove placards.
H. Test starter operation (AMM 49-11-0).
4. Restore Airplane to Normal Configuration
A. Position lower shroud against upper shroud and close shroud latches.
CAUTION: MAINTAIN A MINIMUM CLEARANCE OF 0.18 INCH BETWEEN ENGINE PLUMBING, FIRE DETECTOR, CLAMPS AND INSIDE SURFACE OF LOWER SHROUD. EXERCISE EXTREME CARE NOT TO DAMAGE SHROUD DRAIN LINES WHEN HANDLING SHROUD.
B. Disengage APU compartment access door support rods and stow rods. Close and latch access door.
500
May 01/03 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 49-41-11 Page 403
STARTER BRUSH - INSPECTION/CHECK
1. Prepare for Starter Brush Check
A. Position BATTERY SWITCH and APU MASTER SWITCH to OFF and placard that APU maintenance is "in work."
B. Open the circuit breaker on M280 module APU accessory unit on E3-3 electronic shelf.
C. Open APU compartment access door latches and open access door. Install door support rods.
D. Support lower shroud, open shroud latches, and remove shroud.
CAUTION: EXERCISE EXTREME CARE NOT TO DAMAGE SHROUD DRAIN LINES WHEN HANDLING SHROUD.
2. Check Starter Motor Brushes (Fig. 601)
A. Remove attaching nuts and clamp from starter dust cover. Remove dust cover.
B. Clean brush residue from brushes and brush leads.
NOTE: If brush leads appear to be badly discolored or frayed, remove and replace starter motor (49-41-11).
C. Measure distance from top of brush holder cap to top of each brush. If distance exceeds 0.390 inch, remove and replace starter motor (49-41-11).
NOTE: A 0.340 inch distance from top of brush holder cap to top of each brush assembly equates to approximately 400 APU operating hours remaining, i.e., a 0.290 inch distance equates to approximately 800 APU operating hours remaining.
D. If brush dimensions are acceptable, wipe dust cover clean and install cover and clamp on starter motor. Tighten clamp.
3. Restore Airplane to Normal Configuration
A. Position lower shroud against upper shroud and close shroud latches.
CAUTION: MAINTAIN A MINIMUM CLEARANCE OF 0.18 INCH BETWEEN ENGINE PLUMBING, FIRE DETECTOR, CLAMPS AND INSIDE SURFACE OF LOWER SHROUD.
EXERCISE EXTREME CARE NOT TO DAMAGE SHROUD DRAIN LINES WHEN HANDLING SHROUD.
B. Disengage APU compartment access door support rods and stow rods. Close and latch access door.
C. Close circuit breaker on M280 module APU accessory unit on E3-3 electronic shelf.
D. Remove "APU in work" placard.
E. Test starter operation (Refer to 49-11-0).
May 01/98 49-41-21 Page 601 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
G00569
Starter Brush Check 501
49-41-21Page 602 Figure 601 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Feb 20/85
IGNITION UNIT - REMOVAL/INSTALLATION
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