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Air Starts  
User currently offlineAbzsra From United Kingdom, joined Jan 2001, 15 posts, RR: 0
Posted (11 years 4 months 1 day 10 hours ago) and read 659 times:

Right I understand why on a 737 you only have the one airstart unit connected and start number 1 and the cross bled on stand or after puchback. So how come on a 757 for example you can/nead two airstart units connected? Thanks for your help

Andrew Shanks



6 replies: All unread, jump to last
 
User currently offlineAAR90 From United States of America, joined Jan 2000, 3342 posts, RR: 51
Reply 1, posted (11 years 4 months 1 day 8 hours ago) and read 607 times:

AA's RB-211 powered 757s and V2500 powered MD90s will not start without two airstart carts. One just isn't enough, thus the operating manual requirement for two.

CF6 powered 767s start up quick and pretty on just one though.  Big grin


*NO CARRIER* -- A Naval Aviator's worst nightmare!
User currently offlineNKP S2 From United States of America, joined Dec 1999, 1714 posts, RR: 7
Reply 2, posted (11 years 4 months 1 day 6 hours ago) and read 591 times:

RB211's rally need a large volume of air: There are actually 3 recepticles for ground air for starting on a 757. ( 2 under one panel and a single one just opposite ). BTW, You can airstart the #2 engine on a 737 if great care is taken. The hose is strung along/under the fuselage and one of course keeps his body mass close to the task at hand. The reason it's not often done is that congestion at the gate area with vehicles and bag carts prevent ideal placement of the airstart truck/tow-around unit to properly route the hose.

User currently offlineFDXmech From United States of America, joined Mar 2000, 3251 posts, RR: 44
Reply 3, posted (11 years 4 months 1 day 5 hours ago) and read 581 times:

It's the same with our A310's with the JT9-7R4 as opposed to the CF6. The Pratt requires 2 air start machines due to the much higher air flow requirements of the air turbine starter needed to motor the engine to the prescribed N2 and avoid an unsatisfactory start (hot or hung). The same applies to our Pratt MD11's.

It's inconvenient enough with an APU inop hooking up 1 airstart never mind 2 (especially on a ladder for the MD11). Ahhh, those mechanic friendly GE's. Smile


You're only as good as your last departure.
User currently offlineXxxx10 From United Kingdom, joined Jan 2000, 773 posts, RR: 0
Reply 4, posted (11 years 3 months 4 weeks 22 hours ago) and read 538 times:

I have heard that the engines on the 777 are so big that they cannot be started with ground air so if the apu is inop the plane is grounded

User currently offlineOldman From United States of America, joined Sep 2006, 0 posts, RR: 0
Reply 5, posted (11 years 3 months 4 weeks 19 hours ago) and read 531 times:

It's a matter of specific Airline policy. The 75 will start just fine on one ground air source. That is normal procedure where I worked, also a matter of ambient air temperature. When extreemly hot our procedure was to use two. Sorry I forget the exact numbers.

User currently offlineWilcharl From United States of America, joined Jun 2000, 1158 posts, RR: 3
Reply 6, posted (11 years 3 months 4 weeks 17 hours ago) and read 529 times:

The 717 requires a larger air start unit then the dc-9 or 737 without the larger unit you have to get a Y coupling and tie two together. Apparently one MA1A WILL start a 717 but procedures call for two. When FL got its 1st 717s they had in the "FLY AWAY KIT" a y coupling for stations that did not have an airstart that could push enough CFMs to get the thing going.
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