Installation of the Fuel Overboard Drain Tube [CFMB]

TASK 71-73-49-400-025-A
Installation of the Fuel Overboard Drain Tube

FIN: 1000EM1 ** ON A/C NOT FOR ALL
FIN: 1000EM2 ** ON A/C NOT FOR ALL

1. Reason for the Job
This task is only applicable for engines CFM56-5B PRE SPIB CFM02253MW1.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 25 and 20 lbf.in (0.28 and 0.23 m.daN )
No specific	Torque wrench: range to between 250 and 200 lbf.in (2.83 and 2.26 m.daN )

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
Fuel Overboard Drain Tube

3. Job Set-up
Subtask 71-73-49-860-054-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) On the center pedestal, on the ENG panel 115VU, make sure that a WARNING NOTICE(S) is in position to tell persons not to start the engine.
(2) On the overhead maintenance panel 50VU, make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off. Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).

Subtask 71-73-49-010-072-A ** ON A/C NOT FOR ALL

B. Make sure that the fan cowl doors are open: (Ref. AMM TASK 71-13-00-010-040)
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR

4. Procedure
Subtask 71-73-49-420-056-A ** ON A/C NOT FOR ALL

A. Installation of the Fuel Overboard Drain Tube
(1) Remove the protective covers from the tubes.
(2) Connect the drain tube (5) to the tube. Do not torque the coupling nut at this time.
(3) Attach the drain tube (5) to the bracket on the transfer gearbox with the clamp (10), the bolt (15) and the nut (20).
(4) Attach the drain tube (5) to the bracket at the bottom of the transfer gearbox with the bolt (25), the spacer (30) and the nut (35).
(5) Make sure that the drain tube (5) is aligned correctly on the engine.
(6) TORQUE the nuts (20) and (35) to between 25 and 20 lbf.in (0.28 and 0.23 m.daN )

.
(7) Torque the drain tube.

CAUTION: USE A SECOND WRENCH TO HOLD THE FITTINGS WHEN YOU LOOSEN/TIGHTEN THE TUBE COUPLING NUTS. THIS PREVENTS DAMAGE TO THE TUBES.

(a) TORQUE the drain tube (5) coupling nut to between 250 and 200 lbf.in (2.83 and 2.26 m.daN )

5. Close-up
Subtask 71-73-49-410-057-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 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 WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 02:27:22 UTC