1900 Questions

[D5GRVTY]

I've got my ride booked for Wednesday and in preparation I'd like it if the 1900 experts out there would grill me with the toughest meanest questions you've ever been asked on a ride.

Fire away

P.S. "C" model

[Wally3Wheels]

You're in cruise flight at 20,000' and hear the landing gear motor engage through your headset. Normally it only engages for about one second. This time it continually runs, is this a concern and what can you do to stop this electric motor from running?

[2low]

Shut down both engines and reset the system.

[CP]

Wait 16 sec for auto shut down or if that dont work hit bus sence test isolating the center bus which powers the landing gear motor.

[loadshed]

what immediate indications would you have in the event of a triple fed bus failure?

what can be done if all avionics drop off-line? - and why would it work.

[D5GRVTY]

1. Triple fed bus fail- Half the guages would go dark, no annuc panel (company policy that voltage indicator select is left on triple fed bus) No gear lights etc

2. Pull the avionics circuit breaker, it will bypass the switch.


Awesome, keep em coming

[CP]

The most obvious symptom of a tfb failure would be that the engine instruments would stop working. No need to leave volt meter select switch on tfb. You also lose your no. one avionics bus so Nan/Com#1 goes out.

[CP]

Left gen goes off line. (yellow L Gen annun illuminated) Out put of R gen indicates 31 volts. What happened and what do you do? Hint... It aint in the check list.

[D5GRVTY]

Just checking my facts here re tfb fail, but AFAIK the only engine instruments you would lose is Oil pres/temp and fuel flow. ITT is self generating, torque is AC (inverter powered) and prop and N1 are self generating DC, right?

Did'nt know about which Nav/Com you would lose, thanks

D5

[D5GRVTY]

Right GCU failure? Turn off right gen, reset bus sense left side?

[flaps40]

Just a question but why would you hit the bus sense test switch to isolate the centre bus. Nothing wrong with the bus. The problem is either a hydralic leak or a malfuntion of the pressure switches. What about pulling the curcuit breaker for the landing gear motor, this will stop the cycling....but the gear will eventually sag down. No need to shut down a bunch of systems for an easy fix like that.

[CP]

The landing gear cb should pop after 16 sec if the motor doesnt stop running. But if it didnt you could isolate the center bus using bus sense test. No more power would go to the gear motor. You really dont lose that many systems. Mostly redundant stuff powered off the gen busses but you would have to hand bomb the gear or re- power the center bus for gear extension by using bus sense re-set.

[CP]

D5GRVTY
If you are doing your ride in the sim (YYZ I assume) Its a post UE 93 model so all the instrument guages require a dc input in addition to the signal they are displaying. Pre 93 models have AC torque guages so they would continue to function during a tfb fail .

[D5GRVTY]

Test will be in an a/c, all the way on the west side of the rocks.

[rigpiggy]

Left gen goes off line. (yellow L Gen annun illuminated) Out put of R gen indicates 31 volts. What happened and what do you do? Hint... It aint in the check list.

Problem, overvolt on right gen, tripping reverse current protection on left gen.
Solution Manual tie switch? hold closed will prevent l/r/c gen ties opening with loss of generator, turn off right gen, left gen to reset check voltage if 28, turn left gen on, hit tie reset
edited for brain fart

[rigpiggy]

The landing gear cb should pop after 16 sec if the motor doesnt stop running. But if it didnt you could isolate the center bus using bus sense test. No more power would go to the gear motor. You really dont lose that many systems. Mostly redundant stuff powered off the gen busses but you would have to hand bomb the gear or re- power the center bus for gear extension by using bus sense re-set.

what else critical do you lose off the center bus?

[CP]

Problem, overvolt on right gen, tripping reverse current protection on left gen.
Solution bus tie sense switch? test will open l/r/c gen ties, left gen to reset check voltage if 28, turn off right gen, turn left gen on, hit tie reset

Correct diagnosis. Left GCU sensed reverse current opening up respective line contactor. Solution is to simply turn off the over producing gen, the right one.

[rigpiggy]

see edited copy above. missed it til I re-read my answer

[rigpiggy]

The landing gear cb should pop after 16 sec if the motor doesnt stop running. But if it didnt you could isolate the center bus using bus sense test. No more power would go to the gear motor. You really dont lose that many systems. Mostly redundant stuff powered off the gen busses but you would have to hand bomb the gear or re- power the center bus for gear extension by using bus sense re-set.

slow to 188kias or less

[rigpiggy]

l/r bleed air fail light, l/r brake o'ht lights illuminate all at same time what happened? can you do anything ?

[turbo-prop]

"The landing gear cb should pop after 16 sec if the motor doesnt stop running. But if it didnt you could isolate the center bus using bus sense test. No more power would go to the gear motor. You really dont lose that many systems. Mostly redundant stuff powered off the gen busses but you would have to hand bomb the gear or re- power the center bus for gear extension by using bus sense re-set."

Doing this wouldn't the center bus now be draining the battery?

[rigpiggy]

No as you would isolate the batt off the center bus tie, however if you don't turn the batt off the rt pitot heat will drain the batt. also pneumatic deice comes off the center bus along with the geberator reset

[Wally3Wheels]

Just just took off and and the #1 engine Tq shot to 4500' lbs there was a slight yaw and then everything seemed to straighten up (yaw relatively gone)? Oil pressure, Temp is in the green. What could this be a sign off and do you have to shut the engine down? Why or why not? I guess that one is more of a training question than a PPC question.

You're in cruise and the #2 engine fuel press. annunciator illuminates? What secondary check should you do in additon to initiating the memory checks (which should be something like turning the boost pump for the affected side)?

Hot Start, is there a checklist for it?

[CP]

turbp prop wrote
Doing this wouldn't the center bus now be draining the battery?

No because the generators are the primary power source. But once you lowered the gear you would have to pop open the ties again to re-isolate the center bus so the gear motor would stop running once the gear was down and locked.

[Bede]

Don't you poor suckers have a QRH?? Can you say, call mtc on a ride? Do check pilots actually ask these quesitons? You're a pilot, not a mechanic.