Check Zone 1 Ventilation Inlet and Exit for Blockage [IAE]

TASK 75-21-00-200-010-A
Check Zone 1 Ventilation Inlet and Exit for Blockage

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

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

1. Reason for the Job
Refer to the MPD TASK: 752100-I1
CHECK ZONE 1 VENTILATION INLET AND EXIT FOR BLOCKAGE
This task gives the procedure for a general check of the nacelle compartment and the accessory cooling zone without component removal.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	1	LIGHT SOURCE - INSPECTION
No specific	1	MIRROR - INSPECTION
No specific	AR	WARNING NOTICE(S)

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.V01-002)	cleaning fluid
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

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

D. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-010-A	Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 71-13-00-410-010-A	Closing of the Fan Cowls 437AL(447AL),438AR(448AR)
SRM 541000
CMM 711100
CMM 711300
Nacelle Compartment and Accessory Cooling

3. Job Set-up
Subtask 75-21-00-941-050-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 75-21-00-010-050-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Open the fan cowls (Ref. AMM TASK 71-13-00-010-010).
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR.
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR.
(2) Put the ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position.

Subtask 75-21-00-110-050-A ** ON A/C NOT FOR ALL

C. Clean the Accessory-Zone.
(1) Clean the accessory-zone cooling duct
(a) Use a clean Textile-Lint free Cotton - (Material No.14SBA1) made moist with cleaning fluid (Material No.V01-002) to clean the duct.
(b) Dry the duct with a clean Textile-Lint free Cotton - (Material No.14SBA1) .

4. Procedure
Subtask 75-21-00-210-050-A ** ON A/C NOT FOR ALL

A. Examine the accessory-zone cooling duct and the fan cowl vents. Use the LIGHT SOURCE - INSPECTION and the MIRROR - INSPECTION, if necessary
(1) Examine the accessory-zone cooling duct and make sure there are no unwanted objects in the duct.
(2) Examine the fan cowl vents and make sure there are no unwanted objects that could cause a blockage.

Subtask 75-21-00-210-052-A ** ON A/C NOT FOR ALL

B. Examine the general condition of the accessory-zone cooling duct and the fan cowl vents. Use the LIGHT SOURCE - INSPECTION and the MIRROR - INSPECTION, if necessary
(1) Examine the accessory-zone cooling duct for cracks, dents and damage.
(a) If the duct is cracked, damaged or has dents SRM 541000 (RDN 600) and CMM 711100 (RDN 604).
(2) Examine the fan cowl vents for damage.
(a) If the left fan cowl vent is damaged CMM 711300 (RDN 601).
(b) If the right fan cowl vent is damaged CMM 711300 (RDN 601).

5. Close-up
Subtask 75-21-00-410-050-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 fan cowls (Ref. AMM TASK 71-13-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR.
(3) Remove the WARNING NOTICE(S).
(4) Remove the access platform(s).

[Rev.10 from 2021] 2026.04.01 03:11:03 UTC