AW139 PTS - Main/Tail Rotor

Question 1

What is the Main Rotor Diameter and what is its D value?

Answer 1

45.27ft (13.8m)

D value 55ft (17m)

Question 2

What are the Main and Tail Rotor types?

Answer 2

Both are fully articulated.

Question 3

During the pre-flight how do you know if the dampeners are good?

Answer 3

By checking the fluid level indicator on dampener.

should have a yellow/white band aligned with the reference line

Question 4

What is a flapper limiter?

Answer 4

Engaged/disengaged by centrifugal forces, it prevents excessive flapping.

Question 5

What is the purpose of the ring around the mast?

And why does it need grease?

Answer 5

They are droop stops,
stops the blades hitting the airframe at low RPMs
It needs grease because the blades rub on the ring during the control pre-flight check.

Question 6

What are the limitations if we want to use AEO power index in the yellow?

Answer 6

100% Max Cont
110% 5 min (<90kts)
121% for 5 secs

Question 7

What is the IFR Vmini

Answer 7

50kts

Question 8

What is the minimum autorotation speed?

Answer 8

40kts

Question 9

What is the maximum airspeed for opening/closing the doors?

Answer 9

80kts for opening or closing
Max both locked open - 80kts
Max with only right open - 100kts

Question 10

What is the wind speed limitation for starting/stopping the rotors?
And what’s the logging windspeed?

Answer 10

60kts for starting/stopping

all above 33kts need to be logged in log book

Question 11

Does the main transmission have chip detectors?

If yes, how many?

Answer 11

5
3 Chip detectors (1 MAST and 2 in the sump) in main transmission
1 in the IGB
1 in the TRGB

Question 12

How is the main transmission lubricated and cooled?

Answer 12

Internal oil system distributed by 2 oil pumps in the sump.
Passes through pressure relief and check valves.
Passes through a filter (with bypass)
Cooled by mechanically driven fan and oil cooler matrix.
Delivered via spray system to mast bearings, accessory and tail rotor drives, main rotor gears and input gearboxes.

Question 13

What kind of indications do we have to monitor MGB/IGB/TGB?

Answer 13

MGB Temperature & Pressure (+CAS Messages)

IGB and TGB Temperature (+CAS Messages)

Question 14

Can you Chip burn fuzz?

Answer 14

Yes - with chip burn button

Permitted 3 times on a flight - on 4th indication LASAPrac

Question 15

Can you mix approved oils listed on the RFM?

Answer 15

Not recommended

Question 16

How do we preflight oil levels in the gear boxes?

Answer 16

Via CAS messages - when Nr <2% and engines off.

Question 17

Can you manually check the MGB oil level if requested by maintenance?

Answer 17

Yes - via sight glass

but requires the sliding cowl to be opened.