Hung shut-down
Guest
Posts: n/a
Hung shut-down
My notes have plenty of advice about what to do if one of the ALF-502Rs' hang on start but I can't find any guidance on an engine hang on shut down. Some would advocate pulling the fire handle thus shutting the LP cock, seems to me that at the reduced fuel flow rate in this instance the time delay due to draining the fuel in the system downstream of the LP cock could enable enough of a TGT rise to damage the engine. Others might prefer to re open the HP cock get the core turning and stablised before attempting another normal shut down, this could however mean that you are spraying fuel into an already over-heated low gas flow engine. Ker-boom... good bye Job!
Any-body got any ideas?
Any-body got any ideas?
Guest
Posts: n/a
First of all, how would the engine hang on shut down - No fuel = no motor!
Anyhow - Would there be any point in hitting the Overspeed test button? Im not a 146 man so I don't know the result, nor the ALF engine so the first bit may have a simple answer.
[This message has been edited by Cough (edited 15 May 2001).]
Anyhow - Would there be any point in hitting the Overspeed test button? Im not a 146 man so I don't know the result, nor the ALF engine so the first bit may have a simple answer.
[This message has been edited by Cough (edited 15 May 2001).]
Guest
Posts: n/a
TGT882,
If I EVER catch you NOT reengaging the starter PROMTLY when you have and internal fire, ei the senario you just described, I will personally drink a lot of beer on your credit at your local pub. Well joke aside, what you describe in your post is a rare phenomenon, especially on small jet engines, but it can happen never the less. Itīs caused by an internal fire fuelled by engine oil and the only way out of it is to engage the starter and let it cranck the engine until the tgt or egt is lowered.
Brgds
DOC
If I EVER catch you NOT reengaging the starter PROMTLY when you have and internal fire, ei the senario you just described, I will personally drink a lot of beer on your credit at your local pub. Well joke aside, what you describe in your post is a rare phenomenon, especially on small jet engines, but it can happen never the less. Itīs caused by an internal fire fuelled by engine oil and the only way out of it is to engage the starter and let it cranck the engine until the tgt or egt is lowered.
Brgds
DOC
Hi Claret - that method always worked for me when you saw a TGT rise on the ALF 502 just after shut down - it was fast and effective.
If that didn't work I would go for the overspeed button (which closes the fuel valve at the high pressure pump and is much faster than the handle (all this from memory now
) which closes the fuel valve at the firewall.
Next is to complete the QRH checklist.
If that didn't work I would go for the overspeed button (which closes the fuel valve at the high pressure pump and is much faster than the handle (all this from memory now
) which closes the fuel valve at the firewall.Next is to complete the QRH checklist.
Guest
Posts: n/a
I had one some years ago (have since given up on 146's and taken to 733's ) it went through 1010 degr C before finally giving up the ghost. The fault was a failed TMS -in the extended position. At that stage our airline had specifically banned pushing the os button so the problem became theirs! One thing about CFM's they always stop when asked to!
Guest
Posts: n/a
Clarrie,
Checker's mob do have a QRH item for it although I think it is called "engine fire on ground"
------------------
Stay Alive,
[email protected]
Checker's mob do have a QRH item for it although I think it is called "engine fire on ground"
------------------
Stay Alive,
[email protected]
