...during hydraulic failures by plugging in stowed "handles" into special crank-points located on the cockpit's floor (lift the carpet). How much effort -if this is true- must an arm/arms apply to get the vital reconfiguration comlpeted before...?
2006-09-14 02:40:44 · 7 answers · asked by Fulani Filot 3 in Cars & Transportation ➔ Aircraft
Most commercial aircraft have to have an alternate means of lowering the landing gear and in many cases this involves a manual release system of the landing gear and an auxiliary hydraulic system powered by a hand pump, so yes you are correct. As as the previous answerer's said it isn't that difficult. On the aircraft I have flown the pump handle is stowed in the cockpit behind the seat and a hatch is opened in the floor to reveal the gear release, alternate gear indications and pump handle receptacle.
With respect to flaps, most aircraft do not have a separate manual flap system, and there are procedures in the flight manual for flap up landings, usually at much higher speeds and requiring longer runways.
A gear up landing is considered more hazardous than a flaps up landing therefore the system has to meet more stringent safety criteria, therefore it requires the manual release as a backup to do so.
Hope this answers your question
2006-09-14 03:05:57 · answer #1 · answered by PolarCeltic 4 · 2⤊ 0⤋
Yes some gear can be hand cranked out. The Boeing 727 has a huge crank handle that goes into three places in the floor and each gear gets cranked down separately.
But most modern aircraft use a free fall method
using an emergency handle to pull the uplocks open or uses accumulator pressure (which will remain if the hyd pump fails) or nitrogen to blow the gear down.
For flaps if they are hydraulic they will have a hand pump on small aircraft or a backup electric motor for large jets. For jets that have hydraulic slats (like the 737) they have a separate emergency hyd system to lower them only.
2006-09-14 14:38:33 · answer #2 · answered by Anonymous · 1⤊ 0⤋
Absolutely true on some aircraft, and armstrong gear cranks and flap handles were the only system on some aircraft. However I am not aware of this setup on any commercial passenger aircraft in any form. Look into this.... B-17, B-24. F2F, F3F, F4F, Mooney Mite, just for starters on ldg. gear. Early Piper airplanes equipped with flaps were mechanical and De-Havilland Beavers were hand pump hydraulic, and I am sure there are many more, just that I am getting old and can"t remeber.
2006-09-14 15:50:16 · answer #3 · answered by yp_al_spruce_pine 2 · 0⤊ 0⤋
Most commercial planes do and some light aircraft as well.
It is not that hard to crank down, the problem is in some planes you can't tell if it is working or not or how far down they are.
In a light aircraft sometimes it is better to do a gear up landing especially if it is an "off runway" landing. Also if you have enough runway you can land with flaps "up" (which is really neutral)
2006-09-14 02:49:58 · answer #4 · answered by N3WJL 5 · 0⤊ 0⤋
first of all, except the POH says to diminish the flaps and drop the kit, do no longer do it. A spin isn't the time to test with distinctive configurations. in lots of GA airplanes, getting out of spins may well be so user-friendly as letting bypass of the controls .Others will require the familiar restoration approach utilising rudder and if the plane is self-correcting, it could have a bent to get out with little pilot enter. however, the assumption of dropping the kit and reducing the flaps during a spin, besides being unpredictable introduces extra variables to the equation. If something, right here is what i think of could happen. The flaps promises you a flatter spin, inflicting extra not on time on the restoration. The kit may even upload extra drag, and alter your profile. for the time of the restoration from the dive, you may overstress the flaps or exceed your kit velocity. as far as slowing the plane, nicely, you in user-friendly terms ought to rigidity approximately your vertical velocity. you will unfastened altitude very speedy.
2016-12-18 10:07:36 · answer #5 · answered by ? 4 · 0⤊ 0⤋
Yes its true. Its not that difficult to crank them down. Some landing gears have whats called a blow down bottle for extending the gears. Its pressurized nitrogen that releases from a bottle and quickly puts the gear down.
2006-09-14 02:47:12 · answer #6 · answered by Motorpsycho 4 · 0⤊ 0⤋
Some can be hand cranked. Modern fighter aircraft, no.
2006-09-14 07:42:00 · answer #7 · answered by RANDLE W 4 · 0⤊ 0⤋