COLD WEATHER MAINTENANCE - AIRBORNE AUXILIARY POWER - MAINTENANCE PRACTICES___________________________________________________________________________
 TASK 12-31-49-660-001
 Cold Weather Maintenance - Auxiliary Power Unit
 1. Reason for the Job__________________
 This procedure gives the cold weather maintenance practices for the Auxiliary Power Unit (APU) when the aircraft is in a cold soak condition.
 2. Job Set-up Information______________________
 A. Consumable Materials
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REFERENCE DESIGNATION -------------------------------------------------------------------------------
Material No. 03-003  USA MIL-PRF-7808 LUBRICATING OIL TURBINE SYNTHETIC BASE (Ref. 20-31-00)
 B. Referenced Information
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REFERENCE DESIGNATION -------------------------------------------------------------------------------
R R R R R R  12-31-24-660-001 12-33-21-618-001 12-33-21-618-001 12-33-21-618-001 49-00-00-860-003 49-00-00-860-004 49-00-00-860-005 49-00-00-860-006 49-00-00-860-008 49-00-00-860-009 49-61-34-000-001 49-61-34-000-002 49-61-34-000-003 49-61-34-400-001  Cold Weather Maintenance - Electrical PowerPre-conditioning through the LP Ground ConnectionPre-conditioning through the HP Ground ConnectionPre-conditioning with the APU APU Start by External Power (GTCP 36-300) APU Shutdown by External Power (GTCP 36-300)APU Start by External Power (APS 3200)APU Shutdown by External Power (APS 3200)APU Start by External Power (131-9(A))APU Shutdown by External Power (131-9(A)) Removal of the Electronic Control Box (ECB) (59KD) (GTCP 36-300)Removal of the Electronic Control Box (ECB) (59KD) (APS 3200)Removal of the Electronic Control Box (ECB) (131-9(A)) Installation of the Electronic Control Box (ECB) (59KD) (GTCP 36-300)

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R R R  49-61-34-400-002 49-61-34-400-003 49-90-00-600-002 49-90-00-600-005 49-90-00-600-008  Installation of the Electronic Control Box (ECB) (59KD) (APS 3200)Installation of the Electronic Control Box (ECB) (131-9(A)) Oil Change (Drain Method) (GTCP 36-300) Oil Change (Drain Method) (APS 3200) Oil Change (Drain Method) (131-9(A))
 3. Job Set-up__________
 Subtask 12-31-49-860-050
 A. Not Applicable
 4. Procedure_________ 
R  Subtask 12-31-49-660-055 

R  A. Electronic Control Box 59KD (ECB 59KD) 
R  (1) If the Outside Air Temperature (OAT) is/will be lower than -40 deg.C 
R  (-40.00 deg.F) and the aircraft is not pre-conditioned (heated) 
R  alternatively: 
R  - through the LP ground connection (Ref. TASK 12-33-21-618-001), 
R  - the HP ground connection (Ref. TASK 12-33-21-618-001), or 
R  - with the APU (Ref. TASK 12-33-21-618-001). 
R  (a) Remove the ECB 59KD from the aircraft 
R  - If a GTCP 36-300 APU is installed 
R  (Ref. TASK 49-61-34-000-001) 
R  - If an APS 3200 APU is installed 
R  (Ref. TASK 49-61-34-000-002) 
R  - If a 131-9(A) APU is installed 
R  (Ref. TASK 49-61-34-000-003) 
R  (b) Keep the ECB 59KD in a dry storage at a temperature of between 15 
R  deg.C (59.00 deg.F) and 35 deg.C (95.00 deg.F).

R Subtask 12-31-49-660-056

R  B. Auxiliary Power Unit (APU) 
R  CAUTION : USE ONLY APPROVED TYPES/BRANDS OF LUBRICANTS. DO NOT MIX TYPES_______ 
R  OF LUBRICANTS (TYPE 1 3-CTS OIL WITH TYPE 2 5-CTS OIL). DO NOT 
R  MIX OILS OF DIFFERENT BRANDS MORE THAN NECESSARY. 
R  NOTE : It is recommended to use type 1 OILS (Material No. 03-003) for APU____ 
R  operation in cold weather conditions. 
R  (1) Oil type. 
R  (a) If necessary, do an oil change to type 1 OILS (Material No. 03-
R  003) 
R  - If a GTCP 36-300 APU is installed 
R  (Ref. TASK 49-90-00-600-002). 
R  - If an APS 3200 APU is installed 
R  (Ref. TASK 49-90-00-600-005). 
R  - If a 131-9(A) APU is installed 
R  (Ref. TASK 49-90-00-600-008). 
R  (2) If no external power is available (Ref. TASK 12-31-24-660-001). 
R  (a) It is recommended to start the APU every three hours and operate 
R  it for one hour if the Outside Air Temperature (OAT) is lower 
　
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