(6) Ensure that these values are identical to that on the engine data plate, for N1 andITT respectively.

(7) If the displayed values do not match the engine data plate values:

(a) Ensure there are no engine trim or DCU faults, specifically MB, ME, MF or 7A(Ref. 72-00-00, ENGINE FAULT ISOLATION - 1).

(b) If there are no faults do the Engine Trim Initialization (Ref. Para. 11.).

9. Engine DCU Download

NOTE: Use one of the following methods for periodic or complete downloads of enginedata.

A. Method 1 - Aircraft Central Maintenance Computer (CMC)

(1) The instructions for engine data download are contained in the Aircraft MaintenanceManual (Ref. AMM).

B. Method 2 - P&WC Ground Based Software (GBSLite)

(1) If DCU cable (PWC40549) was used:

(a) Remove the DCU from the engine (Ref. 77-40-01, DATA COLLECTION UNIT -MAINTENANCE PRACTICES).

(b) Connect the DCU cable (PWC40549) to the DCU, to a commercial AC walloutlet, and to a laptop.

(c) Go to step (3).

(2) If DCU T-harness cable (PWC67792) was used:

(a) Remove P36 connector using pliers (PWC90012).

(b) Connect the DCU T-harness cable (PWC67792) onto the DCU, to P36 and to alaptop.

(c) Energize the EEC (Ref. AMM).

(d) Go to step (3).

(3) Start GBSLite from main menu on the computer.

(4) Under the option of ‘‘DIAGNOSTIC ANALYSIS’’, select ‘‘DOWNLOAD DATA’’.

(5) Follow the menu prompts and complete the data download.

(6) Store the data in a suitable location for data analysis or transmission.

(7) If DCU cable (PWC40549) was used:

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(a) Disconnect the cable (PWC40549) from the DCU, the commercial AC walloutlet, and from the laptop.

(b) Install the DCU onto the engine (Ref. 77-40-01, DATA COLLECTION UNIT -MAINTENANCE PRACTICES).

(8) If DCU T-harness cable (PWC67792) was used:

(a) Disconnect cable (PWC67792) from the DCU, to P36 and to a laptop.

(b) De-energize the EEC (Ref. AMM).

(c) Remove P36 connector using pliers (PWC90012).

10. Engine Real Time Display

NOTE: This may be used for advanced troubleshooting.

A. Aircraft Central Maintenance Computer (CMC)

(1) The instructions for monitoring engine parameters in real time are contained in theAircraft Maintenance Manual (Ref. AMM). The aircraft CMC can be used tocompare data from all 3 engines simultaneously.

11. Engine Trim Initialization

CAUTION: EXCHANGING DCU’S FROM ONE ENGINE TO ANOTHER WILL CAUSE THEINCORRECT TRIMS TO BE LOADED ON THE ENGINE. IF THIS OCCURSREMOVE THE DCU AND RE-INITIALIZE.

NOTE: 1. When the EEC is replaced, the EEC will automatically update its own trims, andoperational data from the DCU.

NOTE: 2. When the DCU is replaced with a new unit, the EEC will automatically initialize theDCU.

A. DCU Initialization

NOTE: This procedure can be used if:

(1) Both EEC and DCU are required to be removed and replaced from an engine,

(2) After a shop visit (new, unscheduled, or overhaul), to update the usage information,

(3) When the engine is installed onto the aircraft.

(4) If DCU cable (PWC40549) was used:

(a) Remove the DCU from the engine (Ref. 77-40-01, DATA COLLECTION UNIT -MAINTENANCE PRACTICES).

(b) Connect cable (PWC40549) to the DCU, to a commercial AC wall outlet, and toa laptop.

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