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Engine start max altitude?


mraviator

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The aircraft limitation is that you need to be below 13K FT to perform an APU assisted air start.  I tried it at 10K and I was able to get the aircraft started.  If you were leveled off at 13K did you have the baro set correctly for the area?   The CRJ may have a hard limit in the sim if it calculates you above 13K FT.

 

 

The other alternative is a windmilling re-light, but that requires the aircraft going over 300 KTS to get sufficient air through the engine.  You need to be a lot higher altitude to start that procedure as the aircraft needs to be descending at a rate of 6K / min to get the speed up.

Edited by Cooley
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I should probably mention I was not in flight, but on the ground at Quito, Ecuador (~13400ft). APU started with no issues. I tried both gravity feed and both fuel pumps on, no luck. To try and "trick" the sim, I raised the baro pressure to 33.4 inHg to get a pressure altitude of way below 10k, but that did not do the trick either.

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Quoting from Chapter 2 "Limitations" of the CRJ-200 Airplane Flight Manual, section 4 "Operating Limitations":

Maximum airport pressure altitude for take-off and landing is 8,000 feet.

 

That is, even if you could start the engines, you couldn't legally take off there.

Edited by philipp
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Quito/Mariscal Sucre International (SEQU) is not as high as 13000ft, it's only Elevation is 9229 feet MSL. The new New Mariscal Sucre International Airport (SEQM) is even lower 7910ft (Note the new airport will if it ever gets finished have a Rwy 13451 ft long!). (So you could always hang around at SEQU and hoping the Wx changes a bit or wait till they finish the newer airport SEQM :)

Lots of other aircraft seem to get in and out od SEQU ok. (didn't see any CRJ2's though!

http://uk.flightaware.com/live/airport/SEQU

http://www.trafficpowerhouse.com/readallaboutit/wp-content/uploads/2012/08/quito-airport.jpg

http://skyvector.com/?ll=-0.22759949267374257,-78.34753418334321&chart=301&zoom=1

cessna729.

Edited by cessna729
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Quito/Mariscal Sucre International (SEQU) is not as high as 13000ft, it's only Elevation is 9229 feet MSL. The new New Mariscal Sucre International Airport (SEQM) is even lower 7910ft (Note the new airport will if it ever gets finished have a Rwy 13451 ft long!). (So you could always hang around at SEQU and hoping the Wx changes a bit or wait till they finish the newer airport SEQM :)

Lots of other aircraft seem to get in and out od SEQU ok. (didn't see any CRJ2's though!

http://uk.flightaware.com/live/airport/SEQU

http://www.trafficpowerhouse.com/readallaboutit/wp-content/uploads/2012/08/quito-airport.jpg

http://skyvector.com/?ll=-0.22759949267374257,-78.34753418334321&chart=301&zoom=1

cessna729.

Duh! I was at SLLP, not SEQU. My bad for posting the wrong airport. 

http://en.wikipedia.org/wiki/El_Alto_International_Airport

13325 ft...no wonder they call it El Alto!

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I'm curious if it would be possible to set XP for "start with engines running" or whatever, as a workaround. Probably not, though.

Good idea cruster B)

Just tried it (at SLLP with XP9.70 cos I havn't loaded from DVD SLLP scenery, so the airport sits at about 8ft amsl in XP10.20b11 at the moment so I can srart the engines in that XP version) .

If I load the CRJ engines running (in XP9.70) they  continue running, but when I try Cold-n-dark, I can only start the APU, no luck with the with the two main engines.

cessna729.

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