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PPRuNe Forums (https://www.pprune.org/)
-   Australia, New Zealand & the Pacific (https://www.pprune.org/australia-new-zealand-pacific-90/)
-   -   VN forgot to drop (https://www.pprune.org/australia-new-zealand-pacific/625625-vn-forgot-drop.html)

Global Aviator 23rd Sep 2019 05:18
Well the system worked and caught a fook up. They somehow no doubt managed to do the before landing checklist without confirming all items. We have all seen variations of this no doubt. I heard of someone in a 320 do the same thing...

What was it that was said on completion of the constant speed retrac endorsement... I recall my instructor saying there are those who have and those that.....

Cloud Cutter 23rd Sep 2019 08:08
Originally Posted by BuzzBox (Post 10576757)
A ‘CONFIG GEAR’ EICAS warning is generated if the landing gear is not down and locked and one of the following occurs:
  • Below 800 feet radio altitude and a thrust lever is at idle, or
  • The flaps are in a landing position
A GPWS Mode 4A warning ‘TOO LOW GEAR’ is triggered at 500 ft RA.
Thanks for that info. Does the system on the 787 not use envelope modulation for mode 4? My understanding is that this is standard on all new Honeywell EGPWS, so you should get ‘TOO LOW, GEAR’ at 500 ft above the runway, rather than 500 ft RA.

ACMS 23rd Sep 2019 09:22
Originally Posted by Global Aviator (Post 10576814)
Well the system worked and caught a fook up. They somehow no doubt managed to do the before landing checklist without confirming all items. We have all seen variations of this no doubt. I heard of someone in a 320 do the same thing

I’d say that they didn’t do the Landing checklist at all.....
”✔️ LANDING GEAR.......DOWN“ is a sensed item isn’t it? It wouldn’t have been green ticked and they wouldn’t get CHECKLIST COMPLETE. So unless the ECL was inoperative then they simply didn’t do the Landing checklist at that point.

Outtahere 23rd Sep 2019 19:27
'Checklists are only for the inexperienced pilots'. Heard on the flight deck of one rather large Asian carrier from a Check Capt. They then proceeded to commence taxi with the NWS off (Airbus OEB had it switched off for pushback at the time).

BuzzBox 23rd Sep 2019 23:57
Originally Posted by Cloud Cutter (Post 10576945)


Thanks for that info. Does the system on the 787 not use envelope modulation for mode 4? My understanding is that this is standard on all new Honeywell EGPWS, so you should get ‘TOO LOW, GEAR’ at 500 ft above the runway, rather than 500 ft RA.


I'm not sure - Honeywell says that envelope modulation is used at certain locations to either expand the Mode 4 envelope for improved alerting, or to desensitise it to prevent nuisance alerts. However, the only Boeing reference I can find says that envelope modulation lowers the radio altitude limits to prevent nuisance alerts.

cooperplace 24th Sep 2019 11:35
I've made mistakes with pre-landing checklists (ie, forgot). Only those who've never made a mistake while flying should criticize.

Cloud Cutter 24th Sep 2019 12:34
Originally Posted by BuzzBox (Post 10577763)
I'm not sure - Honeywell says that envelope modulation is used at certain locations to either expand the Mode 4 envelope for improved alerting, or to desensitise it to prevent nuisance alerts. However, the only Boeing reference I can find says that envelope modulation lowers the radio altitude limits to prevent nuisance alerts.
Classic Boeing, dumbing down the manual to what we ‘need to know’ :8


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