Inspect the APU Drain System (APS 3200)

TASK 49-17-00-200-001-A
Inspect the APU Drain System (APS 3200)

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	Torque wrench: range to between 0.495 and 0.405 m.daN (43.81 and 35.84 lbf.in )
No specific	Torque wrench: range to between 3.39 and 3.05 m.daN (25.00 and 22.49 lbf.ft )

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
315AL, 316AR

C. Referenced Information

REFERENCE	DESIGNATION
APU Drains System

3. Job Set-up
Subtask 49-17-00-865-050-A ** ON A/C NOT FOR ALL

A. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	APU/APU/CTL	2KD	L42
121VU	APU/ECB/SPLY	1KD	L41

Subtask 49-17-00-010-050-A ** ON A/C NOT FOR ALL

B. Gain Access
(1) Put the access platform below the APU compartment.
(2) Open the APU access doors 315AL 316AR.

4. Procedure
Subtask 49-17-00-020-050-A ** ON A/C NOT FOR ALL

A. Preparation for Inspection
(1) Remove the support clamps, disconnect the following drain lines from the engine components and the drain mast:

combuster drain
exhaust muffler drain
air by-pass plenum drain
IGV actuator seal
fuel control unit seal
oil pump seal
forward bearing seal witness drain
bleed control valve seal drain

Subtask 49-17-00-200-050-A ** ON A/C NOT FOR ALL

B. Inspection of the Drains

WARNING: WHEN YOU USE COMPRESSED AIR:

USE THE CORRECT PROTECTION (FACE SHIELD OR GOGGLES)
DO NOT POINT THE AIRFLOW AT YOURSELF OR OTHER PERSONS.

LOOSE PARTICLES AND/OR HIGH PRESSURE AIR CAN CAUSE INJURY.

(1) Examine the drain lines and all apertures for blockage. Any blockage must be cleared by blowing through with dry compressed air.
(2) Examine the drain lines and connectors for cracks, distortion, kinks, and damaged threads. Any such damaged lines must be repaired or replaced.
(3) Examine the drain mast for damage and cleanliness. No damage is permitted. Clean as necessary.

Subtask 49-17-00-420-050-A ** ON A/C NOT FOR ALL

C. Installation of the drain tubes
(1) Install the tubes and support clamps previously removed as detailed in paragraph 3.A.
(2) Torque all the tube nuts to between 3.39 and 3.05 m.daN (25.00 and 22.49 lbf.ft )

.
(3) Torque all support clamp bolts to between 0.495 and 0.405 m.daN (43.81 and 35.84 lbf.in )

5. Close-up
Subtask 49-17-00-410-050-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the APU access doors 315AL 316AR.
(3) Remove the access platform(s).

Subtask 49-17-00-865-051-A ** ON A/C NOT FOR ALL

B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	APU/APU/CTL	2KD	L42
121VU	APU/ECB/SPLY	1KD	L41

[Rev.10 from 2021] 2026.04.01 01:28:23 UTC