Landing Gear Flashcards
What is the maximum airspeed for extending the Gear?
165 Kts
After landing, what braking limitations must the pilot comply with when applying the brakes?
35 knots ground speed
When will the HARD LANDING caution segment illuminate?
When any of the landing gear struts experience a landing of at least 3 Gs. Set by micro switches in each landing gear that detects fracture of the shear fuse switch located at the top of the trunnion. It is also set if any of the sensor switches fail. (480-720 FPM (8-12 FPS) rate of descent)
What is the maximum touchdown landing speed?
65 Knots Ground speed- Temporary restriction- 50 Knots ground speed
What provides the power to extend and retract the landing gear?
Hydraulic pressure from the Number 3 hydraulic system
If the number 3 hydraulic system fails in flight, with the gear in the retracted position, can the pilot extend the landing gear for landing?
Yes. The system has a nitrogen blow down system for emergency gear extension
What is the maximum forward speed to activate the landing gear emergency blow down system?
90 KIAS
With a loss of the #1 and #2 converters and the Backup converter, can the landing gear be lowered?
With the DC Ess bus not powered, normal extension is not possible
Using the emergency blow down switch, powered by the Battery Bus, the gear can be lowered. (To power the Batt Bus the Back Up Converter switch must be moved to the off position
How is the landing gear designed to absorb landing or hard landing energy?
Shock struts are an oleo pneumatic type designed to absorb energy during normal and emergency landings 2. A frangible tube absorbs energy from a hard landing.
How is the landing gear held in the extended or retracted position?
The main landing gear is mechanically self locking in both the extended and retracted positions.
How is the nose wheel of the tricycle landing gear controlled on the ground?
It is a castoring type nosewheel free to turn 360°. Nosewheel steering during taxi is achieved by differential braking and yaw thrust from the tail rotor
What causes the landing gear warning “Too Low, Gear” aural alert and illumination of the LDG GEAR warning light?
Airspeed drops below 60 KIAS
Altitude is less than 150 ft agl (based on the rad alt)
Landing gear is retracted
What systems are affected by the WOW switch’s?
TCAS
WX radar
AC under frequency protection in GCU
LDG retraction handle lockout
LDI test of #3 utility system
APU shutdown by ESU
Transponder
Enabling of #3 util gnd test hydraulic pump
Clock flight counter
AWG for Eng fail & Low rotor
What electrical busses power the landing gear controls
DC essential bus
#1 DC Primary bus
What effect does moving the landing gear handle have on the hydraulic system pressure?
It will ramp up the #3 Utility system from depressed to 3500-4200 psi
