Another boring P7 question!!
- vololiberista
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Another boring P7 question!!
What is/was the P7 reading for an engine at idle at SL on an ISA day? Was it just a little more than ambient pressure or a lot more? I know the max was just under 74
- 1103
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Re: Another boring P7 question!!
Next time we run 150 I'll try to remember to make a note
- vololiberista
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Re: Another boring P7 question!!
That's very kind of you. If you could also remember to record the QNH and ambient temperature at the same time. I hope I'm not asking too much.1103 wrote:Next time we run 150 I'll try to remember to make a note
The reason for this query has arisen from the Minimum acceptable P7 graph which only goes up to 8,500ft asl. When one tries calculations for a hot and high airport such as El Alto SLLP the numbers don't appear to work very well. So your input would give a genuine base line which for the moment I'm only guessing at!
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Re: Another boring P7 question!!
On a standard ISA day the P7 gauge would be reading approx 29 In/Hg. After engine start, when conducting your post run checks, you would be looking to see an increase of about 1 In/Hg on the gauges at idle.
Hope that helps.
Hope that helps.
- 1103
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Re: Another boring P7 question!!
I finally remembered to take note when we ran ZA150 today- all 4 engines were showing 32 In/Hg
Paul
Paul
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Re: Another boring P7 question!!
If you want the ambient conditions, have a look at this site: http://www.ogimet.com/display_metars2.p ... &send=send
I've used Farnborough here as a relatively close position, temperatures and pressures wouldn't have been all that different.
I've used Farnborough here as a relatively close position, temperatures and pressures wouldn't have been all that different.
Buttons . . . check. Dials . . . check. Switches . . . check. Little
colored lights . . . check.
colored lights . . . check.
- vololiberista
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- Joined: Tue Jun 15, 2010 10:13 pm
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Re: Another boring P7 question!!
Sorry for the late reply. I'm busy on a special project .Thanks to all. The info was very useful.