AW139 PTS - Landing Gear

Question 1

Max AUM (increased AUW)

Answer 1

14994 lbs

Question 2

Max Op Alt above 14112 lbs

Answer 2

8000ft

Question 3

Temp range

Answer 3

-40 to +35

Question 4

Vne

Answer 4

167kts

Question 5

What supplement deals with operating at an increased gross weight?

Answer 5

Supplement 50

Question 6

Describe the Landing Gear System

Answer 6

Tricycle with extension, retraction (+ emerg via Hyd 1) and braking system.
Hydraulically activated (Hyd 2) and held up, mechanically locked down.
Mains have shock absorbers and WOW on each side and a tyre on each. Retracted by SA actuator and RA actuator.
Nose has auto centring system, oleos, a locking system and 2 tyres.

Question 7

Landing Gear controls and indications?

Answer 7

Lever
Indicators (Amber and green)
Emerg down button
Nose wheel lock button

Question 8

What would you see with a landing gear malfunction?

Answer 8

An amber bar would illuminate to indicate malfunction (not locked with lever down)

Question 9

Sloping limits?

Answer 9

10 deg all sides

Question 10

What are the ground speed limits at 14994 lbs?

Answer 10

20ks (RFM), 10kts (ERA) for taxi
60kts in an emergency
40kts max braking application

Question 11

Min ambient temp for gear?

Answer 11

-40 deg C (Sup 50 with specific part number fitted)

Question 12

Where can you find limitations for gross weight between 14112 - 14994 lbs?

Answer 12

Supplement 50

Question 13

How is the L/G held extended and retracted?

Answer 13

Retracted - hydraulically (No 2)

Down - mechanically locked down

Question 14

VLE and VNO

Answer 14

150kts

Question 15

Normal Description of the brake system

Answer 15

Hydraulic brakes on each main wheel

Permits dynamic and static braking

Question 16

Where is the brake reservoir?

Answer 16

In the nose bay in front of the co-pilot seat.

Question 17

During pre-flight, how do we know if the thickness of the braking pads are good?

Answer 17

There are wear indicators (silver pin) on each main brake assembly

Question 18

What pressurises the brake line?

Answer 18

Pedal brakes.

Question 19

Why do we pump when we select Parking Brake on?

Answer 19

To pressurise the system before applying the parking brake (traps pressure)

Question 20

How do we know when the Parking Brake is set?

Answer 20

OK - Green PARK BRK ON

NO - Amber PARK BRK PRESS

Question 21

Between 14112 and 14994 lbs, what are the parking brake limitations?

Answer 21

1 hr max 10deg slope

Question 22

How many tyres does the AW139 have?

Answer 22

4

Question 23

How are the tyres filled?

Answer 23

tube tyre nosewheels
tubeless mains
All filled with Nitrogen

Question 24

During pre-flight how do you know if the nose gear is locked?

Answer 24

Yellow flag:
Vertical - disengaged
Horizontal - engaged
Or turn on battery and check CAS/LG Panel

Question 25

How do we steer?

Answer 25

Via pedal input + diff braking

Question 26

What is the self-centering azimuth of the nose gear?

Answer 26

115deg

Question 27

Can you retract the L/G if the nosewheel is unlocked?

Answer 27

NO

In hover, WOW switches activate the nosewheel lock automatically after it has been centred by the cams.

Question 28

What are the shocks filled with?

Answer 28

Nitrogen and hydraulic fluid

Question 29

During pre-flight how do we know that the nose gear shocks are filled?

Answer 29

4 fingers visible gap on oleo.

Question 30

What is the purpose of the shocks?

Answer 30

Support helicopter
Absorbs landing forces
Prevents ground resonance

Question 31

Does having an empty shock affect the aircraft stability?

Answer 31

Yes, lack of uniform stability can cause ground resonance.