More Strange S76 Q's for Nick Or Anyone!
A couple of strange electrical occurrences on the A++, would appreciate any info or direction on where to start.
1. Running 100% Nr, battery off, #1 DC gen off. .When #1 DC gen turned on, power is removed from #1 DC Pri bus for about 3 seconds (#1 Fuel flow to zero). .This is not the case on #2 and I have never seen this before.. .Possible clues: - Problem with #1 generator contactor (slow switching from #2 gen to #1 gen)?. . - Problem with bus tie contactor (should stay closed for 2 seconds after no generator power - maybe it's open with no warning light?
2. AC gen fails when either engine goes below 65% N1, as per the Flight Manual. However if the snow blankets are on, the AC gen will stay on line. Question is: if the blankets are off when the engine fails, can you turn on the remaining engine snow blanket and restore the AC gen? (Haven't tried this yet)
3. #2 DC gen will intermittently not come on line until N1 is increased above 65% N1. Doesn't make any difference which engine is started first or if the other generator is switched off to "shock" #2 on. Only increasing the N1 will bring it online. When it is working normally (60% of the time), it comes on line as soon as the starter button is released at 40%N1.
4. Aircraft shut down on ramp. Turn on external power.. .When inverter is turned on the pedals move 2" (to the right) quite forcefully. Vertical gyro (ADI) is just jumping around as it gets powered up.. .AFCS is off. Subsequent attempts to duplicate produced less and less pedal movement until after 4 tries produced no pedal movement. This aircraft has a basic Phase 2 AFCS, but a very strange looking pedal damper (no electrical connections, one hydraulic supply line)
Weird ones aye? Thanks in advance!