Cleaning of the Oil, Hydraulic, and Water Drain Tubes/Hose [CFMB]

TASK 71-73-49-100-001-A
Cleaning of the Oil, Hydraulic, and Water Drain Tubes/Hose

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	ACCESS PLATFORM 1M(3 FT)
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-B	Closing of the Fan Cowl Doors
TASK 71-73-49-000-006-A	Removal of the Oil Tank Drain Tube and Hose
TASK 71-73-49-400-006-A	Installation of the Oil Tank Drain Tube and Hose

3. Job Set-up
Subtask 71-73-49-941-050-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).

Subtask 71-73-49-010-050-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
(2) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(3) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(4) Put an ACCESS PLATFORM 1M(3 FT) in position.

Subtask 71-73-49-020-050-A ** ON A/C NOT FOR ALL

C. Remove the oil, hydraulic, and water drain tubes/hose (Ref. AMM TASK 71-73-49-000-006).

4. Procedure
Subtask 71-73-49-160-050-A ** ON A/C NOT FOR ALL

A. Clean the tubes/hose as follows:
(1) If the tube/hose is blocked, use controlled air supply 30 +/- 5 psi (2.07 +/- 0.34 bar) to clear the blockage.
(2) If the blockage can not be cleared by the use of controlled air, use a clean piece of cloth attached to a length of wire to clear the blockage.
(3) Remove loose dirt from the exterior of the tube/hose with a clean moist cloth.
(4) Dry the surface of the tube/hose with a clean cloth.
(5) For hard to remove dirt or stain use a bristle brush.

5. Close-up
Subtask 71-73-49-420-050-A ** ON A/C NOT FOR ALL

A. Install the oil, hydraulic, and water drain tubes/hose (Ref. AMM TASK 71-73-49-400-006).

Subtask 71-73-49-410-050-A ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-040):
(3) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(4) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(5) Remove the access platform(s).
(6) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.02 06:32:32 UTC