Procedure after Volcanic Ash, Dust, or Sand Ingestion [CFMB]

TASK 72-00-00-200-043-A
Procedure after Volcanic Ash, Dust, or Sand Ingestion

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.

ZONE: 210
ZONE: 400
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)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
210	CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD
400	POWER PLANT, NACELLES AND PYLONS
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 451AL, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 461AL, 462AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 12-13-79-610-002-A	Check oil level and replenish Check Pop Out Indicator of EMCD (Electrical Master Chip Detector)
TASK 12-13-79-610-002-A-01	Check oil level and replenish (Pressure Filling)
TASK 12-13-79-610-003-C	Oil Tank Draining
TASK 12-13-79-610-004-C	Draining of the Accessory Drive Section
TASK 12-13-79-610-005-C	Flushing of Oil System
TASK 71-00-00-710-001-B	Dry Motoring Check
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 72-31-00-290-002-A	Inspection of the High Pressure Compressor Rotor Assembly
TASK 72-42-00-290-005-A	Inspection of the Combustion Chamber and HPT Nozzle Following a Birdstrike/FOD (SAC engine)
TASK 72-42-00-290-005-A-01	Inspection of the Combustion Chamber and HPT Nozzle Following a Birdstrike/FOD (DAC engine)
TASK 72-51-00-290-004-A	Borescope Inspection of High-Pressure Turbine Nozzle Assembly
TASK 72-51-00-290-004-A-01	Borescope Inspection of High-Pressure Turbine Nozzle Assembly
TASK 72-52-00-290-001-B	Borescope Inspection of HPT Blades (from the front and the rear)
TASK 72-52-00-290-001-B-01	Borescope Inspection of HPT Blades (from the front and the rear)
TASK 72-52-00-290-004-A	Borescope Inspection of the High Pressure Turbine Rotor Blade (from the front)
TASK 72-52-00-290-004-A-01	Borescope Inspection of the High Pressure Turbine Rotor Blade (from the front)
TASK 73-21-40-210-002-A	Visual Inspection of the T12 Temperature Sensor
TASK 78-30-00-081-041-B	Make the Thrust Reverser Serviceable after Maintenance
TASK 78-30-00-481-041-B	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-36-00-010-040-B	Opening of the Thrust Reverser Doors
TASK 78-36-00-410-040-B	Closing of the Thrust Reverser Doors
TASK 79-21-10-920-002-B	Remove and Discard Supply Filter
TSM 77

3. Job Set-up
Subtask 72-00-00-941-133-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 72-00-00-010-174-A ** ON A/C NOT FOR ALL

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

Subtask 72-00-00-040-091-A ** ON A/C NOT FOR ALL

C. Make the thrust reverser unserviceable for maintenance (Ref. AMM TASK 78-30-00-481-041).

Subtask 72-00-00-010-175-A ** ON A/C NOT FOR ALL

D. Open the thrust reverser doors (Ref. AMM TASK 78-36-00-010-040):
(1) FOR [1000EM1] (ENGINE-1)
451AL, 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL, 462AR.

4. Procedure
Subtask 72-00-00-280-077-A ** ON A/C NOT FOR ALL

A. Volcanic Ash, Dust, or Sand Inspection
(1) The following requirements are subsequent to incidents of engines flown or operated in volcanic ash, dust, or sand (reference CFM56-5B SB 72-0770 for operation in meteorological modeling predicted ash cloud areas).
(a) Visually check the engine inlet and exhaust areas for evidence of damage or excessive erosion.
(b) Borescope inspect the High Pressure Compressor (HPC) and the High Pressure Turbine (HPT) for evidence of the following (Ref. AMM TASK 72-31-00-290-002), (Ref. AMM TASK 72-42-00-290-005), (Ref. AMM TASK 72-51-00-290-004), (Ref. AMM TASK 72-52-00-290-001) , (Ref. AMM TASK 72-52-00-290-004):

NOTE: Do not water wash engines exposed to volcanic ash.

NOTE: Inspect all stages of the HPC. The aft stages of the HPC will be most effected by erosion.

NOTE: Inspect the HPT nozzle vanes and the HPT blades for erosion and accumulation of solidified material. Sufficient amounts of material accumulation on the HPT nozzle vanes can cause a reduced engine stall margin.

1 Excessive erosion.
2 Foreign Object Damage (FOD).
3 Build-up of ash, dust, or sand deposits that have solidified on the HPT nozzle vanes and HPT blades.
a If material has solidified on the HPT vanes or blades, contact CFM.
(c) Oil system
1 Replace supply oil filter (Ref. AMM TASK 79-21-10-920-002).
2 Drain oil (Ref. AMM TASK 12-13-79-610-003) and (Ref. AMM TASK 12-13-79-610-004).
3 Replace oil (Ref. AMM TASK 12-13-79-610-002).
(d) Monitor engine operation to determine if a shift in performance parameters has occurred. If parameters are abnormal, TSM 77.
(e) Check for proper cooling of ignition leads.
(f) Check condition of T12 temperature sensor (Ref. AMM TASK 73-21-40-210-002).
(g) Flush accessory and transfer gearboxes (Ref. AMM TASK 12-13-79-610-005).
(h) Check for fouling of Low Pressure Turbine (LPT) case air cooling scoop and precooler scoop on thrust reverser.
(2) The following requirements are subsequent to incidents of engines not flown or operated in volcanic ash, dust, or sand, but have been exposed to volcanic ash, dust, or sand on the ground.

NOTE: Do not water wash an engine that has been exposed to volcanic ash, dust, or sand. Particles may accumulate in the HPT nozzle vanes and HPT blade cooling paths. Material may accumulate in the HPC rotor spools and cause rotor imbalance.

(a) Inspect the engine inlet and exhaust for accumulation of ash, dust, or sand particles.
1 Vacuum any particles from accessible areas of the inlet and exhaust.
2 Dry motor the engine for two minutes (Ref. AMM TASK 71-00-00-710-001).
3 Borescope the HPC and HPT at six o'clock positions to inpect for ash, dust, or sand (Ref. AMM TASK 72-31-00-290-002), (Ref. AMM TASK 72-42-00-290-005), (Ref. AMM TASK 72-51-00-290-004), (Ref. AMM TASK 72-52-00-290-001) , (Ref. AMM TASK 72-52-00-290-004).
4 If loose material is still present in the engine flow path, dry motor the engine for two more minutes.
5 Repeat the borescope inspection and dry motoring until all material has been removed.
(b) Oil System
1 Replace supply oil filter (Ref. AMM TASK 79-21-10-920-002).
2 Drain oil (Ref. AMM TASK 12-13-79-610-003) and (Ref. AMM TASK 12-13-79-610-004).
3 Replace oil (Ref. AMM TASK 12-13-79-610-002).
(c) Monitor engine operation to determine if a shift in performance parameters has occurred. If parameters are abnormal, (Ref. TSM 77-00-00).
(3) Do a one time repeat borescope inspection at the next maintenance visit, before 6 months, 1000 Flight Hours (FH) or 400-800 cycles, whichever occurs first, to ensure HPT nozzle vane and HPT blade integrity.

5. Close-up
Subtask 72-00-00-410-177-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 thrust reverser doors (Ref. AMM TASK 78-36-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL, 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL, 462AR.

Subtask 72-00-00-440-091-A ** ON A/C NOT FOR ALL

B. Make the thrust reverser serviceable after maintenance (Ref. AMM TASK 78-30-00-081-041).

Subtask 72-00-00-410-178-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL, 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL, 448AR.
(2) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 02:40:42 UTC