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Duct Pressure For Engine Start  
User currently offlineTaguilo From Argentina, joined Aug 2005, 74 posts, RR: 0
Posted (8 years 11 months 1 week 1 day 8 hours ago) and read 3881 times:

Hi,

Does any of you recall which was the minimum duct pressure where it was possible to start the engines? In this case, did you need almost the "standard?" 2 min starter ON for the spool process, I mean, was it a low spool rate?

Many Thanks
Tom

8 replies: All unread, jump to last
 
User currently offlineSlamClick From United States of America, joined Nov 2003, 10062 posts, RR: 68
Reply 1, posted (8 years 11 months 1 week 1 day 8 hours ago) and read 3872 times:

Well, an old MD-80 manual I still have says minimum of 36 PSI, minus 1 PSI for every thousand feet of airport elevation.

I have started DC-9 engines at Flagstaff Arizona and at Mexico City and don't recall them taking much more time to wind up than they did at lower elevations. Maybe some, but it really doesn't stand out in my memory.
Most pneumatic systems deliver plenty of pressure and volume.



Happiness is not seeing another trite Ste. Maarten photo all week long.
User currently offlineFr8mech From United States of America, joined Sep 2005, 5470 posts, RR: 14
Reply 2, posted (8 years 11 months 1 week 1 day 7 hours ago) and read 3867 times:

Different aircraft/engines have different pressures. The norm is somewhere around 35 psi with the valve open. Start times also differ with engine type and temperature.


When seconds count...the police are minutes away.
User currently offlinePhilSquares From , joined Dec 1969, posts, RR:
Reply 3, posted (8 years 11 months 1 week 1 day 6 hours ago) and read 3859 times:

Quoting Taguilo (Thread starter):
Does any of you recall which was the minimum duct pressure where it was possible to start the engines?

744 is 30 PSI. Start limit is 2 minutes from fuel on to stabilized at idle rpm.


User currently offline320tech From Turks and Caicos Islands, joined May 2004, 491 posts, RR: 5
Reply 4, posted (8 years 11 months 1 week 1 day 6 hours ago) and read 3851 times:

A320 is minimum 28 psi, I believe, don't have the book handy. Max starter engagement is 2 minutes. Usually you see 30-35 psi from the APU, and 44 psi from the engine. Lots of pressure available.

If the starter's running for two minutes, there's a problem. I would say most starts are complete within 30 - 40 seconds.



The primary function of the design engineer is to make things difficult for the manufacturer and impossible for the AME.
User currently offlineTaguilo From Argentina, joined Aug 2005, 74 posts, RR: 0
Reply 5, posted (8 years 11 months 1 week 1 day 6 hours ago) and read 3844 times:

Thank you for the replies.

Now, minimum psi is measured BEFORE or AFTER switching starter to GND??


User currently offlineHAWK21M From India, joined Jan 2001, 31684 posts, RR: 56
Reply 6, posted (8 years 11 months 1 week 1 day 4 hours ago) and read 3827 times:

B737 Min 30psi.Ideal 40psi.
regds
MEL



Think of the brighter side!
User currently offlineB747FE From Hong Kong, joined Jun 2004, 230 posts, RR: 4
Reply 7, posted (8 years 11 months 1 week 1 day 3 hours ago) and read 3821 times:

Quoting Taguilo (Thread starter):
Does any of you recall which was the minimum duct pressure where it was possible to start the engines?

30 PSI (minus 1 PSI x 1,000 FT airport elevation) and time limit is 90 seconds to accelerate from "fuel on" to idle rpm, in the 747 Classic.

Quoting Taguilo (Reply 5):
Now, minimum psi is measured BEFORE or AFTER switching starter to GND??

Pressure must be checked after start valve is open.

Regards,
B747FE.



"Flying is more than a sport and more than a job; flying is pure passion and desire, which fill a lifetime"
User currently offlineNZ1 From New Zealand, joined May 2004, 2268 posts, RR: 25
Reply 8, posted (8 years 11 months 1 week 11 hours ago) and read 3781 times:
AIRLINERS.NET CREW
FORUM MODERATOR

767 is normally 34psi.

NZ1


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