Bell 212
Joined: Oct 2006
Aviation Qualifications: A&P
Posts: 1,346
Likes: 270
From: USA
cjg...
Technically....you should actually perform an operational check of each separate affected DC system prior to any paralleling checks after replacing a DCU...
The M&O was never really clear on this...and if memory is correct it was actually dealt with in Vendor's manuals on DCU.
But straight up... yes...you need to parallel the DCU's if changed out...even if swapped...as the #1 and #2 systems are independent of each other....
w1
Technically....you should actually perform an operational check of each separate affected DC system prior to any paralleling checks after replacing a DCU...
The M&O was never really clear on this...and if memory is correct it was actually dealt with in Vendor's manuals on DCU.
But straight up... yes...you need to parallel the DCU's if changed out...even if swapped...as the #1 and #2 systems are independent of each other....
w1
Joined: Mar 2004
Posts: 310
Likes: 1
From: Indonesia
The answer is yes do it. Its easy but holding the screwdriver on the tiny adjustment screw with a slottted head is a skill. Refer to BHT212 MM 96-39. The DC electrics in general are from 96-24 on. Worth a read. PB
Last edited by piggybank; 7th October 2012 at 19:47.
Joined: Jun 2012
Posts: 21
Likes: 0
From: Canada
Yeah make sure the plastic insulating sleeve is in place around the test connections where you plug in your multimeter, if the positive probe of your meter shorts out to the case of the DCU it'll fry. This is especially hard on single bus machines since the extra relays are in the way of the number one DCU's probe ports. Don't forget the different voltage setting for cold weather operations.
