Safety Features Flashcards
built-in to stop the gear being retracted when it’s not safe to do so and to warn the crew if they are attempting to land with the gear not extended
safety features
To avoid damage to the airframe structure, the nosewheel must always be aligned in the _____ and _____ direction prior to retraction.
fore, aft
A number of methods are used to ensure that alignment of fore and aft direction are done prior retraction automatically. These are hydraulic nose wheel centering on aircraft with ________ and ________.
power steering, self centering cam system
To prevent inadvertent retraction of the landing gear when it’s not safe to do so, a safety device is incorporated which prevents the landing gear selector lever being selected __. This safety device consists of a __________ which retains the selector in the down position and is released by the operation of an ________________.
up, mechanical lock, electrically operated solenoid
On smaller aircraft, electrical power to the solenoid is controlled by switches mounted on the ______________.
main gear shock absorber struts
When the struts are compressed, the switches are _____ but as the struts extend after takeoff the switch contacts _____.
open, close
The electrical supply to the solenoid is completed thus releasing the selector lever lock and allowing the landing gear to be selected ____.
up
On larger aircrafts, the _______ may have to be tilted to the correct angle for the lever lock to be released.
main gear trucks
On larger aircrafts with body gear steering, the gear will have to be _________ for the lever lock to be released.
aligned fore an aft
A means of overriding the lock such as by mechanical means is provided for use in the event of ________ and for maintenance purposes.
solenoid failure
Flight crews should exercise great care in using __________.
bypass facility
Normally, a bypass facility should only be used when called for in a checklist as raising the gear hydraulically when parts of it are incorrectly positioned can cause catastrophic damage to both the ______ and the ________.
gear, airframe
These are intended to prevent inadvertent retraction of the gear when the aircraft is on the ground.
landing gear ground locks or locking pins
Landing gear ground locks or locking pins are usually consisted of these which interfere with the operation of the gear in such a way that it is impossible for the gear to move when they are in position.
pins or metal sleeves
Landing gear ground locks or locking pins consist of pins or metal sleeves are fitted with ______ which help prevent crew from inadvertently getting airborne with them still in position on the gear.
warning flags
It is incorporated in the system to guard against landing with the landing gear not locked down.
aural warning
It is often provided to allow certain flight exercises to be carried out without unnecessary warnings.
aural warning isolation switch
Different aircraft types use different criteria for the operation of the aural warning and isolation switch which normally involve a combination of ______ and ________ positions.
flap, throttle
What does EGPWS stand for?
Enhanced Ground Proximity Warning System
If fitted, this will give a “too low” gear warning when passing a specified radio altitude with the gear not locked down.
Enhanced Ground Proximity Warning System (EGPWS)
A means of lowering the landing gear and locking it in the down position is provided to cater for the possibility of ________ in the normal system.
failure
Once the up locks have been released, the landing gear lowers or free falls under its own weight and the down locks are engaged mechanically by _______.
springs
In the typical system, pulling the handle to the ________ releases the door up lock allowing the door to fall open.
first detent
Pulling the handle to the ________ releases the gear up lock which allows the gear to drop to the down position.
second detent
A heavy spring in the down lock actuator forces the over center mechanism into the __________ position.
locked down
If the gear has been lowered by free fall method, there will be no power available to close the hydraulically operated doors after extension so they will remain open, and the door open light will remain illuminated.
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