Installation of the Heat Exchanger Drain Tube [CFMB]

TASK 71-73-49-400-026-A
Installation of the Heat Exchanger Drain Tube

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

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	WARNING NOTICE(S)
No specific	Torque wrench: range to between 13.35 and 12.54 lbf.ft (1.81 and 1.70 m.daN )
No specific	Torque wrench: range to between 26.70 and 25.81 lbf.ft (3.62 and 3.50 m.daN )
No specific	Torque wrench: range to between 25 and 20 lbf.in (0.28 and 0.23 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
Heat Exchanger Drain Tube

3. Job Set-up
Subtask 71-73-49-860-055-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 71-73-49-010-073-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 71-73-49-420-057-A ** ON A/C NOT FOR ALL

A. Installation of the Heat Exchanger Drain Tube
(1) Remove the protective covers from the heat exchanger, the drain manifold module, and the drain tube.
(2) Connect the heat exchanger drain tube (35) to the heat exchanger. Do not torque the coupling nut at this time.
(3) Connect the drain tube (35) to the drain manifold module. Do not torque the coupling nut at this time.
(4) Attach the drain tube (35) to the clamp on the fuel pump drain tube (15) with the clamp (20), the bolt (25) and the nut (30).
(5) Attach the drain tube (35) to the bracket near the fuel pump with the clamp (20), the bolt (25) and the nut (30).
(6) Connect the hydro mechanical unit and fuel servos drain tubes (5) and (10) to the drain tube (35). Do not torque the coupling nuts at this time.
(7) Make sure that the drain tube (35) is aligned correctly on the engine.
(8) TORQUE the nuts (30) to between 25 and 20 lbf.in (0.28 and 0.23 m.daN )

.
(9) Torque the drain tubes and coupling nuts.

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 for drain tube (5) coupling nut to between 13.35 and 12.54 lbf.ft (1.81 and 1.70 m.daN )

.
TORQUE the drain tubes (10) and (35) coupling nuts to between 26.70 and 25.81 lbf.ft (3.62 and 3.50 m.daN )

5. Close-up
Subtask 71-73-49-410-058-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 12:55:51 UTC