Measure the clearance between the left hand fan cowl seal bumper and the Accessory Gear Box (AGB) [CFMB]

TASK 71-13-00-200-001-A
Measure the clearance between the left hand fan cowl seal bumper and the Accessory Gear Box (AGB)

1. Reason for the Job
This task is not applicable to left fan which have already a trimmed seal bumper.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
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
NSRM 542000
Masking Tape
Steel Ruler Utilisation

3. Job Set-up
Subtask 71-13-00-941-065-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 71-13-00-010-068-A ** ON A/C NOT FOR ALL

B. Get Access

CAUTION: USE YOUR HANDS TO OPERATE THE FAN COWL LATCHES. IF YOU USE SOMETHING DIFFERENT FROM YOUR HANDS TO OPERATE THE LATCHES, YOU CAN CAUSE DAMAGE TO THE LATCHES.

(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR.

4. Procedure
Subtask 71-13-00-220-055-A ** ON A/C NOT FOR ALL

A. Detect the position corresponding to the minimum clearance.
(1) Apply CP (tape) on the right fan cowl to flatten the seal on a length of 11.8 in. (30 cm) before the center latch.

Masking Tape ** ON A/C NOT FOR ALL

(2) Before closing the fan cowl doors (Ref. AMM TASK 71-13-00-410-040), delimit the width of the AGB by writing marks on the tape.
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR

CAUTION: BE CAREFUL NOT TO CAUSE DAMAGE TO THE SEAL AND THE AGB WITH THE STEEL RULER.

(3) Insert vertically the steel ruler through the interstice of the closed fan cowls till contact with AGB.

Steel Ruler Utilisation ** ON A/C NOT FOR ALL

NOTE: If necessary, delatch to insert the steel ruler more easily, and latch again to perform the measurement.

(a) Move the steel ruler along the cowl, limited by the marks which visualize the width of the AGB, to detect position corresponding to the minimum value.
(b) Record the value found at the minimum clearance position (dimension A).
(c) Put a mark on a tape on the left fan cowl to visualize the position of the minimum clearance.

Subtask 71-13-00-220-056-A ** ON A/C NOT FOR ALL

B. Measure the height between the fan cowl door skin and the seal bumper.
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-040)
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Measure with a slide calliper the height between the edge of the seal bumper and the fan cowl skin where the dimension A has been measured.

NOTE: Use the mark done in step 3 (c)

(a) Record the value found (dimension B).

Subtask 71-13-00-220-057-A ** ON A/C NOT FOR ALL

C. Calculate the clearance between the left hand fan cowl and the AGB.
(1) Subtract the dimension A to the dimension B.
(a) If the value is bigger or equal to 0.12 in. (3 mm), no action is necessary.
(b) If the value is strictly lower than 0.12 in. (3 mm), apply NSRM 542000, Repair n 13, to trim the Left Hand door seal bumper.

5. Close-up
Subtask 71-13-00-410-073-A ** ON A/C NOT FOR ALL

A. Close Access

CAUTION: USE YOUR HANDS TO OPERATE THE FAN COWL LATCHES. IF YOU USE SOMETHING DIFFERENT FROM YOUR HANDS TO OPERATE THE LATCHES, YOU CAN CAUSE DAMAGE TO THE LATCHES.

(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] 2026.04.02 06:32:17 UTC