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25th Mar 2009, 11:17

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anchorriver

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A300/310 Hung Start (Ground) QRH Procedure

My fellow PPRuNe users,

I would be grateful if you can enlighten me with your technical knowledge regarding this procedure. QRH states;

When N2 below 20%
HP BLEED VALVE (affected engine)…..OFF
ENG START selector…..CONT RELIGHT
SECOND START ATTEMPT…..PERFORM

According to FCOM1-17-60, p3/4, the pack valves are controlled closed if the INGNITION selector is on START A, START B or CRANK position. So, with ENG START selector in CONT RELIGHT position, in this case, the pack valves are controlled OPEN, I assume.

So, now you have HP BLEED VALVE (affected ENG) OFF, as well as the PACK VALVES open. Would you explain to me why this would improve the ENG start performance after experiencing hung start?

Thanks in advance. Safe flight, guys.

Anchor river

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