Originally Posted by Old Smokey
The fire bell is never inhibited automatically on any aircraft that I know of. It can be inhibited by the crew, but other visual warnings remain.
Originally Posted by Fat Dog
Actually Old Smokey not quite true.
B757 Operations Manual:
'Warning Inhibits
The Master WARNING lights and fire bell are inhibited for fire during part of the takeoff. The inhibit begins at rotation and continues until the first to occur:
• 400 feet AGL, or
• 20 seconds elapsed time
If a fire occurs during the inhibit, an EICAS warning message appears, but the fire bell and Master WARNING lights do not activate. If the warning condition still exists when the inhibit is removed, the fire bell and Master WARNING lights activate immediately.'
Actually Smokey, it has been 'done' in the latest variant of the DC9, understand that you have some time in the '9'
Boeing 717-200 FCOM Volume III
"Takeoff Inhibits - Level 3 alerts and associated MASTER WARNING lights are inhibited from V1 to 400' RA, but no longer than 25 seconds in flight."
If a FIRE L ENG, FIRE R ENG, or APU FIRE is detected at V1 to 400' RA, the Engine Alerting Display will show a boxed red alert, but no fire bell will sound nor will the red MASTER WARNING illuminate until after 400' RA/25s.