757 Gpws
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Join Date: Aug 2001
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757 Gpws
On the 737-NG the input to the EGPWS is the Capt. Radio Altimeter, #1GS, FMC, #1ADIRU, landing gear and flap switches, SMYD. If loosing the Capt. radio alt. no GPWS will work.
Is this also the case in the 757.
(just a student pilot with a huge interest in Boeing systems)
Cheers
Is this also the case in the 757.
(just a student pilot with a huge interest in Boeing systems)
Cheers
Join Date: Jul 2002
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It depends what causes the loss of the captains radio alt. obviously if its the Radio Alt unit itself then your not going to get GPWS as the radio alt unit has a direct feed to the GPWS me thinks.
I might stand corrected tho.
I might stand corrected tho.
Join Date: Jun 2000
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Can't tell you the system specifics but have flown one with the capts rad alt failed (twice actually), and the EGPWS and GPWS were fine.
Our winter sim a while back was also based on this failure :
While gear is not down, effects are :
i) With either throttle at idle EICAS warning GEAR NOT DOWN, with no aural alert.
ii) With either throttle at idle and flap in any position other than up, EICAS warning GEAR NOT DOWN, with aural alert.
iii) With either throttle at any position and flap at either 25 or 30, EICAS warning GEAR NOT DOWN, with aural alert.
Our winter sim a while back was also based on this failure :
While gear is not down, effects are :
i) With either throttle at idle EICAS warning GEAR NOT DOWN, with no aural alert.
ii) With either throttle at idle and flap in any position other than up, EICAS warning GEAR NOT DOWN, with aural alert.
iii) With either throttle at any position and flap at either 25 or 30, EICAS warning GEAR NOT DOWN, with aural alert.
Join Date: Feb 2001
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GPWS operation with L/H Rad Alt inop is dependent on whether you have a singe or multi-source datalink.
Later 757/767 aircraft have the multi-source datalink whereby any Rad Alt can supply the GPWS
All 757/767 with EGPWS will have the multi-source datalink.
Later 757/767 aircraft have the multi-source datalink whereby any Rad Alt can supply the GPWS
All 757/767 with EGPWS will have the multi-source datalink.
