Check Team FR

On 2/27/2023 at 7:30 PM, Check Team FR said:

Hi, 

when should we preserve a propeller on an airplane?

After how many days of aircraft immobilization, do you start preserving a propeller?

Preservation is planned for checks but is it necessary for immobilization of less than 15 days or 1 month or 2 months?

Hello, i have a another problem, ASB 54H60-61-A157 say a propeller is adequately preserved if the propeller is rotated once in 2 month.

But the preservation in P5059 is it necessary for have a adequately preserved propeller or just a rotation ?

And last question, a aircraft immobilized for check may be considered like an active aircraft (term in ASB) ?

Thanks for your responce.

Hi, 

when should we preserve a propeller on an airplane?

After how many days of aircraft immobilization, do you start preserving a propeller?

Preservation is planned for checks but is it necessary for immobilization of less than 15 days or 1 month or 2 months?

15 hours ago, pjvr99 said:

I understand what you're saying, having read through the card. It just seems that youre trying to do individual component testing on parts that should be checked on a bench. 

 

The only places i know of that uses "hg is the cabin pressure differential, engine lighthouse area and the apu bleed air regulator. All other pressures are psi. 

 

For conversion 14.69psi = 29.91"hg

I understand, it's not in "Hg.

I want just to have the pressure values for a inlet pressure (between 30 to 35 PSI) of APU, like asked in the work card.

I think the values of card are false for application on aircraft.

I researche the limits values in the pressure sensing line when start engine with APU ?

On 3/9/2022 at 6:41 AM, pjvr99 said:

If you're having very specific starting problems, this may be a way to troubleshoot. As long as APU holds pressure above 32psi and start time is between 39 and 61 seconds, there is no reason to do this procedure .....

It's not for a specific starting problem but it's planned for maintenance of "C"-Check.

I see in TO for test of Start Valve, with a inlet pressure of 150 PSI, max regulated air pressure is 42 PSI and the mini 36.5 with inlet pressure of 45 PSI.

Not in In/Hg, sure.

We can't have a regulated pressure superior at the inlet pressure.

But actually APU provides a inlet pressure between 30 to 35 PSI, what is the regulated air pressure ? More precisely in the pressure sensing line.

For Starter and air control valve operational check, WE connect a gauge with a tee to the Starter sensing line. (SMP515C - SP213)

APU fournish 35 psig

When engine start, WE must observe at the pressure gauge, a pressure between 36.5 and 42 psig.

But i dont know is psig may be inch/Hg ?

Because air pressure is always under this limites.

If is psig what is the problem?

But if it's in/Hg, the pressure is good.

Thanks

After adjustment of pneumatic thermostat at 620°C and RPM at 100%, we have a pressure at 21 psig max. (With 2 cc pack).

The adjustment of air pressure regulator may be doing only with analyzer APU ?

If the compressor was eroded, the pressure was under 22 psig for start engine like with 2 cc pack ?

Do know if exist documentation on APU compressor liquid wash like engine (SP240) ?

Thanks

APU GTCP85-180L run normally.

Bleed air check > 35 psig

For starting engine, pressure at pressure gage is superior to 30 psig.

But with air conditionning cargo ans flight station comp on norm position, the pressure is under 22 psig.

The EGT is adjust to 620°c

RPM to 100%.

Bleed air valve APU is checked.

After that, the pressure is always under 22 psig.

With only one air conditionning comp, how much is the pressure drop ?

Thanks

6 hours ago, AMPTestFE said:

Sounds like some with the AUX VENT circuit?  I remember the only time they open is in OFF & AUX VENT...but tripping when you shut down the cargo pack...maybe not.  It’s likely a valve, versus a solenoid, right?  What about the underfloor heat valve?  Doesn’t it also close when you shut down the cargo AC?

My experience is only on Es & Hs, so not sure what differences in the J....but you didn’t say what model you’re on.

This is C-130H.

Thank you I had a second info and when we set the cargo switch and air cond shutoff switch to OFF, the breaker is also triggered after 2 seconds. After a little more in-depth research, we think Flow control shutoff valve cargo, it remains open and trips the breaker when closing. We're going to test the power line just in case, but we're going to replace the valve.

At the end of the flight, when the aircraft is reconditioned: When I set the Air conditioning Master Switch to OFF or AUX VENT, the breaker cabin press and AUX Vent triggers after 2 seconds. On positions NO PRESS, PRESS MAN or AUTO PRESS, the breaker does not trip ... I have a doubt about a piece of equipment but I would like to have your avionics opinion. Thank you