Topics in Category: General Electric - Rotate.Aero https://rotate.aero Sat, 30 May 2020 13:14:33 +0000 MYOB /media/kunena/images/icons/rss.png Topics in Category: General Electric - Rotate.Aero en-gb Fan Blade Lube - by: Mark D Francis https://rotate.aero/forum/cf6-80a/331-fan-blade-lube#599 https://rotate.aero/forum/cf6-80a/331-fan-blade-lube#599

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CF6-80A Mon, 19 Aug 2019 17:49:38 +0000
ATA 76-11, Engine Fuel Conditioning - by: Mark D Francis https://rotate.aero/forum/80a-76/327-ata-76-11-engine-fuel-conditioning#595 https://rotate.aero/forum/80a-76/327-ata-76-11-engine-fuel-conditioning#595
The pneumatic start valve was operational. The spar fuel valve was also working correctly. The engine fuel valve was not opening and valve indication light stayed on.


We hung a replacement Fuel Conditioning Unit, which was no help. The conditioning unit has an actuating piston which is attached to the fuel control (or MEC - Main Engine Control as it is usually called). Fuel is allowed to flow with the piston extended.



We noticed the installed unit and the replacement had "maybe" an inch worth of travel distance. To be sure this was enough, we opened up the other engine. We noticed twice (maybe three times as much) piston travel on the known good conditioner. We hung the replacement unit on the good engine, which also moved this greater distance.

A conditioner control relay (K168) was tried which was no help. Open command voltage at the conditioner plug was significantly lower than 28VDC.

The problem turned out to be high resistance on the fire control handle switch. After a few cycles of the fire handle, all valve operations were normal. A dirty fire handle switch contact was restricting current flow. The piston moved... just not enough.



Power for the conditioner goes through the fire handle switch first. Next in line is the fuel shut-off handle, followed by the control relay. Two situations are represented by the engine valve light. With the shut-off handle up and the conditioner not fully extended, the light will be on. With the shut-off handle down and the conditioner not fully retracted, the light will be on.]]>
ATA 76 Engine Controls Wed, 07 Aug 2019 21:55:45 +0000
ATA 76-12, GE CF6-80C2A5F Engine Fuel Solenoid - by: Mark D Francis https://rotate.aero/forum/cf680c2-76/103-ata-76-12-ge-cf6-80c2a5f-engine-fuel-solenoid#397 https://rotate.aero/forum/cf680c2-76/103-ata-76-12-ge-cf6-80c2a5f-engine-fuel-solenoid#397
30 minutes instead of 30 seconds.

So...... one more time.

P/N 2680287 CPN 7310819]]>
ATA 76 Engine Control Thu, 15 Jun 2017 03:51:23 +0000
ATA 78-30, Thrust Reverser - by: Mike Forti https://rotate.aero/forum/ge78/217-ata-78-30-thrust-reverser#383 https://rotate.aero/forum/ge78/217-ata-78-30-thrust-reverser#383 ATA 78 Exhaust Fri, 12 May 2017 11:34:46 +0000 MD-10-10 Engine Start - by: Mike Forti https://rotate.aero/forum/6d-80/167-md-10-10-engine-start#254 https://rotate.aero/forum/6d-80/167-md-10-10-engine-start#254 ATA 80 Starting Sun, 06 Nov 2016 13:58:30 +0000 ATA 79-30, Engine Oil Pressure - by: Mark D Francis https://rotate.aero/forum/cf680c2-79/156-ata-79-30-engine-oil-pressure#229 https://rotate.aero/forum/cf680c2-79/156-ata-79-30-engine-oil-pressure#229


ECAM oil pressure (and quantity) is derived from the analog oil pressure/qty indicator. In this case the needle is down at zero and the only way to rule out the transmitter is to run the engine. Instead of an engine heat cycle some simple things can be tried first.



Believing that it could be a "downstream" problem. Simply selecting each SGU off will put both ECAM screens on a single unit.




The problem remained on either SGU. Moving "upstream", a cycle of the SDAC breakers was tried.




The problem remained after the breakers were reset. This did not rule out the SDAC, but the damn things come up stupid at times.
The only thing left to try before being forced to either open up or start the engine is a indicator swap. These particular ones were frickin tight in the panel. So..... the next best option is pull the panel up (recommended with power off).



After a plug swap......






A300-600 ASM 79-30-00
Indicator Replacement AMM 79-33-21-04
(Different sub-chapter depending on whether GE or Pratt)]]>
ATA 79 Engine Oil Wed, 28 Sep 2016 18:19:58 +0000
ATA 72-23, Fan Outlet Guide Vane - by: Mike Forti https://rotate.aero/forum/cf680c2-72/21-ata-72-23-fan-outlet-guide-vane#172 https://rotate.aero/forum/cf680c2-72/21-ata-72-23-fan-outlet-guide-vane#172 ATA 72 Engine Sun, 10 Apr 2016 15:18:00 +0000 ATA 71-10, Engine Cowlings, Why??? - by: Mark D Francis https://rotate.aero/forum/d1f-71/127-ata-71-10-engine-cowlings-why#162 https://rotate.aero/forum/d1f-71/127-ata-71-10-engine-cowlings-why#162
I twist it all off and throw it away.



Cowl closing procedures:
ATA 71-10-00-2-1
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ATA 71 Engine General Mon, 21 Mar 2016 03:08:09 +0000
ATA 80-00, GE CF6-80C2A5F Engine Sart - by: Mark D Francis https://rotate.aero/forum/cf680c2-80/96-ata-80-00-ge-cf6-80c2a5f-engine-sart#110 https://rotate.aero/forum/cf680c2-80/96-ata-80-00-ge-cf6-80c2a5f-engine-sart#110
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ATA 80 Engine Start Mon, 29 Jun 2015 23:51:49 +0000