A73-21-00-201.fm
ENGINE FUEL AND CONTROL - ENGINE CONTROL - EEC BITE - MAIN MENU
January 1, 2004
73-21
- 9 -
SOUTHWEST AIRLINES PROPRIETARY(c) All rights reserved
SOUTHWEST AIRLINES.
737-700 MAINTENANCE TRAINING MANUAL
ENGINE FUEL AND CONTROL - ENGINE CONTROL - EEC BITE RECENT FAULTS
General
The RECENT FAULTS function gives you the faults stored in EEC non-volatile memory (NVM) for the last three flight legs. The EEC stores up to 10 faults in each dispatch level. If there are 10 faults stored in EEC memory for a given dispatch level during the last 10 flight legs and a new fault occurs with the same dispatch level, the EEC erases the oldest fault to make space for the new fault. One fault shows on each page. The EEC erases all faults that are older than 10 flight legs.
If data is not available from both EEC channels, you see a message that tells you which EEC channel the MCDU cannot use. You select CONTINUE to see the data for the channel the MCDU can use.
The dispatch level shows on line 3 of the RECENT FAULTS screen.
Line 5 gives the maintenance message number. You use this number to find the correct fault isolation procedures to correct the fault.
Lines 6, 7, and 8 give a short description of the fault.
Lines 9 through 11 show the last three flight legs and which leg or legs has the fault. The X under the flight leg number shows the fault on this page occurred during that leg. Flight leg 0 is the most recent engine ground run. The EEC puts faults from ground runs in flight leg 1 when the airplane goes to air mode.
The AIR/GROUND system sends an air/ground signal to the DEUs. The DEUs then send this signal to the EECs. The EECs use the air/ground signal and air speed to increment the leg count when the airplane goes to air mode.
If there are no faults for the last three flight legs and the last ground run, the MCDU shows the NO RECENT FAULTS message.
You select HISTORY to see the last 10 flight legs.
A73-21-00-203.fm
January 1, 2004
73-21
- 10 -
SOUTHWEST AIRLINES PROPRIETARY(c) All rights reserved
SOUTHWEST AIRLINES.
737-700 MAINTENANCE TRAINING MANUAL
A73-21-00-203.fm
ENGINE FUEL AND CONTROL -ENGINE CONTROL - EEC BITE RECENT FAULTS
January 1, 2004
73-21
SOUTHWEST AIRLINES PROPRIETARY(c) All rights reserved
SOUTHWEST AIRLINES.
737-700 MAINTENANCE TRAINING MANUAL
ENGINE FUEL AND CONTROL - ENGINE CONTROL - EEC BITE FAULT HISTORY
General
The FAULT HISTORY function gives you the faults stored in EEC non-volatile memory (NVM) for the last 10 flight legs. The EEC stores up to 10 faults in each dispatch level. If there are 10 faults stored in EEC memory for a given dispatch level during the last 10 flight legs and a new fault occurs with the same dispatch level, the EEC erases the oldest fault to make space for the new fault. One fault shows on each page. The EEC erases all faults that are older than 10 flight legs. A new leg begins when the EEC detects transition from ground to air.
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