PA-34 power setting sequence
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Joined: Jan 2002
Posts: 6
Likes: 1
From: In a perambulator.
At the risk of sticking my neck into somewhere I haven't been for a while, might I suggest that power settings used at a twin training school are not necessarily those that would be used in real time by a charter pilot quite correctly handling the engines on the same machine.
Joined: Jan 2004
Posts: 5,658
Likes: 501
From: Canada
Flight training procedures should be 100% in accordance with the POH. An important part of all training, but especially, advanced training is inculcating students with the importance of understanding all of the aircraft systems and knowing what the expected performance should be for every phase of flight.
The only way this can be achieved is by integrating the POH into every lessons.
With respect to piston twins and charter flying I have had to beat out the stupid " flight schoolism " from numerous new hires. Why can't the school just teach it the right way from the beginning ?
The only way this can be achieved is by integrating the POH into every lessons.
With respect to piston twins and charter flying I have had to beat out the stupid " flight schoolism " from numerous new hires. Why can't the school just teach it the right way from the beginning ?
Joined: Jan 2011
Posts: 80
Likes: 0
From: amsterdam
In my turbocharged commander 114tc (se) max take off power is 39/2575.
Once airborne over 1000ft agl I will go to high climb power 35/25 .. Later I will go to normal climb power 30-31/24
Cruise is 29-31/22-24.
Square on a turbocharged piston in this category? I think not.. Only at approach speed. 23/23 gives 120kts.
I allways reduce throttle first. The reason is that when you reduce rpm the mp will always rise a bit. You do not want to do that when you are already at max.
The other thing is that its the easy way to work the flow from left to right .. First throttle, then rpm, then the fuelmix
Once airborne over 1000ft agl I will go to high climb power 35/25 .. Later I will go to normal climb power 30-31/24
Cruise is 29-31/22-24.
Square on a turbocharged piston in this category? I think not.. Only at approach speed. 23/23 gives 120kts.
I allways reduce throttle first. The reason is that when you reduce rpm the mp will always rise a bit. You do not want to do that when you are already at max.
The other thing is that its the easy way to work the flow from left to right .. First throttle, then rpm, then the fuelmix
Joined: May 2001
Posts: 4,729
Likes: 0
From: 75N 16E
Same in my commander, except O/B is 42" MP.
So I normally use 40" on take off (which can be fun jiggling the throttle on the take off roll as you normally get an increase in MP as the roll gets faster), once the flaps are up reduce to 36" and leave prop full forward for the climb (as per the POH). At TOC MP back to 31" and RPM back to 24" for a fast cruise.
So I normally use 40" on take off (which can be fun jiggling the throttle on the take off roll as you normally get an increase in MP as the roll gets faster), once the flaps are up reduce to 36" and leave prop full forward for the climb (as per the POH). At TOC MP back to 31" and RPM back to 24" for a fast cruise.
Joined: Aug 2016
Posts: 1
Likes: 0
From: Naas
Seneca V
Hello guys
Taken from Seneca V POH:
4.29(k)
When power is reduced for descent, the mixtures should be enriched as altitude decreases. The propellers may be left at cruise setting; however if the propeller speed is reduced, it should be done after the throttles have been retarded. Cowl flap should normally be closed and the T.I.T should be maintained at approximately 1300F or higher to keep engines at the proper operating temperature. Set the altimeter. Adjust the windshield defrost as required during descent.
Hope it helps.
Taken from Seneca V POH:
4.29(k)
When power is reduced for descent, the mixtures should be enriched as altitude decreases. The propellers may be left at cruise setting; however if the propeller speed is reduced, it should be done after the throttles have been retarded. Cowl flap should normally be closed and the T.I.T should be maintained at approximately 1300F or higher to keep engines at the proper operating temperature. Set the altimeter. Adjust the windshield defrost as required during descent.
Hope it helps.
Joined: Jan 2008
Aviation Qualifications: CPL
Posts: 650
Likes: 45
From: Canada
however if the propeller speed is reduced, it should be done after the throttles have been retarded.
Yes, you can further reduce RPM by selecting a more coarse propeller pitch, though I cannot think of any reason to do this in a twin, other than to stretch a glide after a dual engine failure. Having the props selected to coarse with the power is very low is generally harmless, unless you suddenly advance the throttles (like to go around). If you advance the throttles with the prop levers well back, it will be very quiet still, and rapidly become very expensive.
I can't imagine what Piper envisioned when they wrote that, but I would avoid doing it without a profound understanding of engine operation, and a compelling reason. An engine operating at maximum RPM is noisy, but it is protecting itself from detonation. Reducing RPM while maintaining the power setting is taking you toward detonation conditions, and you will only find out afterward that you were there, with a maintenance bill or engine failure.
Joined: Nov 2005
Posts: 729
Likes: 1
From: Zulu Time Zone
Joined: Jun 2002
Posts: 3
Likes: 5
From: Wor Yerm
I'm with tmmorris -.RTFM. I really don't care what schools teach unless they teach what is in the manufacturer's AOM. Far too often rumour, heresay, personal foibles and hobby-horses and down right ignorance get in the way of the correct way of doing things.
PM
PM
Joined: Jul 2003
Posts: 1,092
Likes: 10
From: uk
Been a while since I have flown PA34 but could the reduction of rpm to 2500 cause the MP to drop to a suitable climb MP setting like 35".
I know when I first went on the PA34 throttling back would drive me nuts as reducing the rpm caused the MP to drop and needing resetting. (Turbo slowing down).
I know we teach TPM to reduce power but does reducing rpm first to 2500 cause the MP to drop say 35".
If throttle comes back to 35" first, then pitch to 2500 does the MP drop below 35 requiring resetting?
Can't remember since not having taught on them for 15 years since the CAA killed of multi rating to mortal souls.
I know when I first went on the PA34 throttling back would drive me nuts as reducing the rpm caused the MP to drop and needing resetting. (Turbo slowing down).
I know we teach TPM to reduce power but does reducing rpm first to 2500 cause the MP to drop say 35".
If throttle comes back to 35" first, then pitch to 2500 does the MP drop below 35 requiring resetting?
Can't remember since not having taught on them for 15 years since the CAA killed of multi rating to mortal souls.
