ATA 24 Electrical Power
1 - IDG & CSD oil servicing. 737-ALL
2 - Complete circuit-breaker list for in your pocket. 737-6/7/8/900
3 - Interactive training and cb module. (needs MS-Access to play) 737-6/7/8/900
4 - 737-300 electrical schematic powerpoint presentation. 737-3/4/500
5 - 737NG electrical power sources overview. 737-6/7/8/900
6
- IDG
drainplug cracks due to overtorque. 737-6/7/8/900
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1-
IDG & CSD oil servicing. 737-ALL
We still make many errors with "servicing" these things. Thus Sundstrand has made the arrow glass of the IDG better. Philosophy is that, irrespective of the temperature, the CSD/IDG always must be able to be serviced. At the CSD there is a rule effective that is not well stated in the manual! It can never filled above the middle of the band. Differently, it can never be drained when the level comes under the middle of the band. At normal operating temperature, after cooling, the oil quantity will never come under the band. Differently, at warming up to operating temperature the quantity will never come above the band. If the oil quantity comes outside the band damage to the CSD/IDG will occure. (It has occured that an engine could not be started because of a overfilled CSD.> OIL LOCK) .
Text & pictures provided by R. Meijer. See the illustrations for better explanation:
>> 737-1/2/3/4/500:
>>737-6/7/8/900
6 - IDG
drainplug cracks due to overtorque. 737-6/7/8/900
When you change the oil of the IDG, check the IDG drainplug for cracks. It often happens that the plug is installed with a too high torquevalue, causing it to crack or even break apart. The plug is not that strong and made of aluminum. It might cause a small oil leak making the IDG looking 'wet' without finding a clear source of the leak. The torque value is about 65 lbs/inch iaw amm 12-13-21. See pictures of a cracked drainplug. The p/n = MS9954-05
