Preservation/Storage/Depreservation of the Integrated Drive Generator (IDG)

TASK 24-21-00-550-803-A
Preservation/Storage/Depreservation of the Integrated Drive Generator (IDG)

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: WEAR GOGGLES, INSULATED GLOVES AND OTHER PROTECTIVE CLOTHES. HOT OIL CAN BURN YOUR EYES AND SKIN. IF OIL TOUCHES YOUR EYES OR SKIN, GET MEDICAL AID.

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

ZONE: 435
ZONE: 436
ZONE: 445
ZONE: 446
FIN: 4000XU1 ** ON A/C NOT FOR ALL
FIN: 4000XU2 ** ON A/C NOT FOR ALL

1. Reason for the Job
This procedure gives the instructions necessary to do:

The preservation of the IDG off-wing and on-wing when you put the aircraft into storage
The depreservation of the IDG off-wing and on-wing when you operate the aircraft again after a storage period.

The preservation of the IDG prevents corrosion and deterioration, thus it is necessary to put it into:

Storage for less than six months
Storage for more than six months
A storage container.

The preservation procedure will give maximum protection to the IDG. You must do it in clean and dry conditions.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 1M(3 FT)
No specific	AR	BAG - PLASTIC
No specific	AR	CAP - BLANKING
No specific	AR	COVER - PROTECTION
No specific	AR	PLUG - BLANKING
No specific	1	TAPE - ADHESIVE

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.08BBB1)	Non Aqueous Cleaner-- Petroleum Based -
(Material No.12ADB1)	Corrosion Preventive Compound-Water Displacing & Heavy Duty Hard Film -
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
435	FAN AND ACCESSORY GEARBOX
436	FAN AND ACCESSORY GEARBOX
445	FAN AND ACCESSORY GEARBOX
446	FAN AND ACCESSORY GEARBOX
FOR [1000EM1] (ENGINE-1)
437AL, 438AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 461AL, 462AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 12-13-24-612-803-A	Integrated Drive Generator (IDG) Servicing - Filling of the IDG with Oil or Addition of Oil after a Level Check
TASK 12-13-24-680-802-A	Draining of the Oil from the Integrated Drive Generator (IDG)
TASK 24-21-00-210-805-A	Check of the Oil Level and Oil-Filter Differential-Pressure Indicator (DPI)
TASK 24-21-00-210-807-A	Inspection of the IDG Oil Charge and Scavenge Filter Elements
TASK 24-21-51-000-803-A	Removal of the Integrated Drive Generator - IDG 1(2)
TASK 24-21-51-400-803-A	Installation of the Integrated Drive Generator - IDG 1(2)
TASK 24-21-51-960-801-A	Replacement of the IDG Oil Charge and Scavenge Filter Elements
TASK 71-00-00-860-823-A	Start the Engine (Normal Automatic Start)
TASK 71-00-00-860-833-A	Procedure to Prevent Engine Motoring
TASK 71-13-00-010-802-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-802-A	Closing of the Fan Cowl Doors
TASK 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-805-A	Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-36-00-010-802-A	Opening of the Thrust Reverser Cowl-Doors
TASK 78-36-00-410-802-A	Closing of the Thrust Reverser Cowl-Doors

3. Job Set-up
Subtask 24-21-00-941-100-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Do the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).

Subtask 24-21-00-010-128-A ** ON A/C NOT FOR ALL

B. Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-802):
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR

Subtask 24-21-00-040-069-A ** ON A/C NOT FOR ALL

C. Deactivation of the Thrust Reverser System for Ground Maintenance

WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.

(1) Do the deactivation of the thrust reverser system for ground maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 24-21-00-010-129-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Open the thrust-reverser cowl-doors (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL 462AR
(2) Put an ACCESS PLATFORM 1M(3 FT) in position.
(3) Installation of the engine protection covers

CAUTION: INSTALL PROTECTION COVERS ON ALL THE OPENINGS IMMEDIATELY TO PREVENT DAMAGE TO THE ENGINE.

(a) Install all the necessary COVER - PROTECTION to prevent damage to the engine.

4. Procedure

NOTE: You can select the off-wing or the on-wing procedure to do the preservation and the depreservation of the IDG.

Subtask 24-21-00-620-064-A ** ON A/C NOT FOR ALL

A. Preservation of the IDG Off-Wing
(1) Replace the oil filter (Ref. AMM TASK 24-21-51-960-801).
(2) Fill the IDG with oil (Ref. AMM TASK 12-13-24-612-803).
(3) Drain the oil from the IDG (Ref. AMM TASK 12-13-24-680-802).
(4) Remove the IDG (Ref. AMM TASK 24-21-51-000-803).
(5) Do a visual inspection of the external surfaces of the IDG for damage:
(a) If you find damage, send the IDG to the workshop to repair the damage.
(6) Do a visual inspection of the external surfaces of the IDG for missing paint:
(a) If paint is missing, paint the IDG. To do this, obey the manufacturer's instructions.
(7) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(8) Put the PLUG-BLANKING in each disconnected line end.
(9) Put the IDG into a container for storage. To do this, obey the manufacturer's instructions.

Subtask 24-21-00-620-054-A ** ON A/C NOT FOR ALL

B. Preservation of the IDG On-Wing

NOTE: You can select the step related to the applicable IDG storage period.

(1) For the storage period of less than six months, do the steps that follow:
(a) Do a visual inspection of the external surfaces of the IDG for damage. If you find damage:
1 Remove the IDG (Ref. AMM TASK 24-21-51-000-803).
2 Send the IDG to the workshop to repair the damage.
3 Get a serviceable IDG.
4 Install the serviceable IDG (Ref. AMM TASK 24-21-51-400-803).
a If the serviceable IDG stayed into storage for more than six months, replace the oil filter (Ref. AMM TASK 24-21-51-960-801).
5 Go to step (f).
(b) Before you put the IDG into storage, make sure that the IDG is serviceable.
(c) Do a visual inspection of the external surfaces of the IDG for missing paint:
1 If paint is missing, paint the IDG. To do this, obey the manufacturer's instructions.
(d) If the life of the oil or oil filter is less than 50% of the life specified in the Maintenance Planning Document (MPD), do as follows:
1 Make sure that there is no contamination on the sight glass. If there is contamination:
a Clean the sight glass with the Textile-Lint free Cotton - (Material No.14SBA1) made moist with Non Aqueous Cleaner-- Petroleum Based - (Material No.08BBB1) .
b Remove the remaining solvent and contamination with the clean Textile-Lint free Cotton - (Material No.14SBA1) .
2 Make sure that the oil level is at the top of the green band.
3 If the oil level is below the top of the green band, do as follows:
a Fill the IDG with oil (Ref. AMM TASK 12-13-24-612-803).
b Start the engine to make sure that the oil flows through the IDG and the external circuit (Ref. AMM TASK 71-00-00-860-823).
(e) If the life of the oil or oil filter is more than 50% of the life specified in the MPD, do as follows:
1 Replace the oil filter (Ref. AMM TASK 24-21-51-960-801).
2 Fill the IDG with oil (Ref. AMM TASK 12-13-24-612-803).
3 Start the engine to make sure that the oil flows through the IDG and the external circuit (Ref. AMM TASK 71-00-00-860-823).
(f) Use the COVER - PROTECTION or the BAG - PLASTIC:

To give protection to the engine drain mast
To make sure that humidity does not go into the IDG.

(2) For the storage period of more than six months, do the steps that follow:
(a) Do a visual inspection of the external surfaces of the IDG for damage. If you find damage:
1 Remove the IDG (Ref. AMM TASK 24-21-51-000-803).
2 Send the IDG to the workshop to repair the damage.
3 Get a serviceable IDG.
4 Prevent damage to the IDG:
a Apply TAPE - ADHESIVE on:

The input spline
The O-ring
The input seal area
The valves that are adjacent to the input pad.

b Do not remove the input flange, the gasket and the screws.
c Clean the input pad area with the Textile-Lint free Cotton - (Material No.14SBA1) .
d Apply the Corrosion Preventive Compound-Water Displacing & Heavy Duty Hard Film - (Material No.12ADB1) on the input face and the input pad.
e Remove the TAPE - ADHESIVE from:

The input spline
The O-ring
The input seal area
The valves that are adjacent to the input pad.

5 Install the serviceable IDG (Ref. AMM TASK 24-21-51-400-803).
a If the serviceable IDG stayed into storage for more than six months, replace the oil filter (Ref. AMM TASK 24-21-51-960-801).
6 Go to step (j).
(b) Before you put the IDG into storage, make sure that the IDG is serviceable.
(c) Do a visual inspection of the external surfaces of the IDG for missing paint:
1 If paint is missing, paint the IDG. To do this, obey the manufacturer's instructions.
(d) Remove the IDG (Ref. AMM TASK 24-21-51-000-803).
(e) Prevent damage to the IDG:
1 Apply TAPE - ADHESIVE on:

The input spline
The O-ring
The input seal area
The valves that are adjacent to the input pad.

2 Do not remove the input flange, the gasket and the screws.
3 Clean the input pad area with the Textile-Lint free Cotton - (Material No.14SBA1) .
4 Apply the Corrosion Preventive Compound-Water Displacing & Heavy Duty Hard Film - (Material No.12ADB1) on the input face and the input pad.
5 Remove the TAPE - ADHESIVE from:

The input spline
The O-ring
The input seal area
The valves that are adjacent to the input pad.

(f) Install the IDG (Ref. AMM TASK 24-21-51-400-803).
(g) Replace the oil filter (Ref. AMM TASK 24-21-51-960-801).
(h) Fill the IDG with oil (Ref. AMM TASK 12-13-24-612-803).
(i) Start the engine to make sure that the oil flows through the IDG and the external circuit (Ref. AMM TASK 71-00-00-860-823).
(j) Use the COVER - PROTECTION or the BAG - PLASTIC:

To give protection to the engine drain mast
To make sure that humidity does not go into the IDG.

(k) At intervals, do a visual inspection of the IDG external surfaces for corrosion damage.

NOTE: The recommended intervals for the inspection are as follows:

A minimum of one time each year, or
When you do the usual engine maintenance and/or inspections.

It is possible to change the frequency of the intervals (use your experience and the storage location to make the decision).

(l) Do steps (d) thru (f) again, as necessary.

Subtask 24-21-00-630-061-A ** ON A/C NOT FOR ALL

C. Depreservation of the IDG Off-Wing
(1) Install a serviceable IDG (Ref. AMM TASK 24-21-51-400-803).

Subtask 24-21-00-630-054-A ** ON A/C NOT FOR ALL

D. Depreservation of the IDG On-Wing

NOTE: You can select the step related to the applicable IDG storage period.

(1) For the storage period of less than six months, do the steps that follow:
(a) Do a visual inspection of the external surfaces of the IDG for corrosion and damage. If you find corrosion and damage:
1 Remove the IDG (Ref. AMM TASK 24-21-51-000-803).
2 Send the IDG to the workshop for inspection, test and approval.
3 Get a serviceable IDG.
4 Remove the COVER - PROTECTION or the BAG - PLASTIC from the engine drain mast.
5 Install the serviceable IDG (Ref. AMM TASK 24-21-51-400-803).
a If the serviceable IDG stayed into storage for more than six months, replace the oil filter (Ref. AMM TASK 24-21-51-960-801).
6 Do the inspection of the filter elements (Ref. AMM TASK 24-21-00-210-807).

NOTE: It is possible to have corrosion on the cooler system.

(b) Do the steps that follow if:

The life of the oil and/or oil filter is more than 50% of the life specified in the MPD, or
There was no replacement of the oil filter and/or oil during the IDG preservation procedure.

1 Replace the oil filter (Ref. AMM TASK 24-21-51-960-801).
2 Fill the IDG with oil (Ref. AMM TASK 12-13-24-612-803).
(c) Remove the COVER - PROTECTION or the BAG - PLASTIC from the engine drain mast.
(d) Start the engine to make sure that the IDG operates correctly (Ref. AMM TASK 71-00-00-860-823).
(e) Do the inspection of the filter elements (Ref. AMM TASK 24-21-00-210-807).
(f) Do a check of the IDG oil level (Ref. AMM TASK 24-21-00-210-805).

NOTE: It is possible to have corrosion on the cooler system.

(2) For the storage period between six months and two years, do the steps that follow:
(a) Do a visual inspection of the external surfaces of the IDG for corrosion and damage. If you find corrosion and damage:
1 Remove the IDG (Ref. AMM TASK 24-21-51-000-803).
2 Send the IDG to the workshop for inspection, test and approval.
3 Get a serviceable IDG.
4 Remove the COVER - PROTECTION or the BAG - PLASTIC from the engine drain mast.
5 Install the serviceable IDG (Ref. AMM TASK 24-21-51-400-803).
a If the serviceable IDG stayed into storage for more than six months, replace the oil filter (Ref. AMM TASK 24-21-51-960-801).
6 Do the inspection of the filter elements (Ref. AMM TASK 24-21-00-210-807).

NOTE: It is possible to have corrosion on the cooler system.

(3) For the storage period of more than two years, do the steps that follow:
(a) Remove the IDG (Ref. AMM TASK 24-21-51-000-803).
(b) Send the IDG to the workshop for inspection, test and approval.
(c) Install a serviceable IDG (Ref. AMM TASK 24-21-51-400-803).
(d) If it is not possible to do steps (a) thru (c), do as follows:
1 Do a visual inspection of the external surfaces of the IDG for damage.
2 Replace the oil filter (Ref. AMM TASK 24-21-51-960-801).
3 Fill the IDG with oil (Ref. AMM TASK 12-13-24-612-803).
4 Remove the COVER - PROTECTION or the BAG - PLASTIC from the engine drain mast.
5 Start the engine to make sure that the IDG operates correctly (Ref. AMM TASK 71-00-00-860-823).
6 Do the inspection of the filter elements (Ref. AMM TASK 24-21-00-210-807).

NOTE: It is possible to have corrosion on the cooler system.

7 Do a check of the IDG oil level (Ref. AMM TASK 24-21-00-210-805).
8 With a maximum of 25 Flight Hours (FH) of the IDG, do as follows:
a Remove the IDG (Ref. AMM TASK 24-21-51-000-803).
b Send the IDG to the workshop for inspection, test and approval.
c Install a serviceable IDG (Ref. AMM TASK 24-21-51-400-803).

5. Close-up
Subtask 24-21-00-410-124-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) Put the aircraft back to its initial configuration.
(3) Remove the access platform(s).
(4) Close the thrust-reverser cowl-doors (Ref. AMM TASK 78-36-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
451AL and 452AR.
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
461AL and 462AR.

Subtask 24-21-00-440-066-A ** ON A/C NOT FOR ALL

B. Do the reactivation of the thrust reverser system after ground maintenance (Ref. AMM TASK 78-30-00-440-805).

Subtask 24-21-00-410-125-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR
(2) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.03.31 23:19:38 UTC