MSPU Flashcards
What change must be made if I wanted to increase rotor rpm?
Shorten the pitch change links, all 4 equally.
1 flat equals 1% change in RPM.
What pockets are wedge allowed in?
4, 7, and 9
What is the primary and secondary aim of rotor track and balance?
Primary is to reduce vibrations
Secondary is a goal of no more than 1/4” track split
How often should wedge be inspected and replaced?
Every 125 hrs
What are the torque specs on T/R balance weights?
80-100” Lbs
How many and what size are the tail rotor weights?
There are 3
- 3=1 gram
- 5=3 grams
- 7=11 grams
How many and what size are the main rotor weights?
2
113 grams
52 grams
Should only have weight on 2 blades
What is the max number of weights I can have on the main rotor?
9 not to exceed 1017 grams.
What would be cause to make a 2408-13-1 write up?
A caution indication on the PC-GBS software
What are the 4 tachs and where are they located?
Tach 1-Main rotor, mag pickup, from swashplate
Tach 2-Tail rotor, from swashplate
Tach 3-Nr, jumper wire to isolation transformer
Tach 4-generator tach from the HPSM
How many accelerometers are there and which ones are critical?
18 total,
4 & 5-T/R gearbox vertical and lateral
6-Intermediate gearbox
18-APU clutch
Critical meaning the MSPU system won’t work without.
How often am I required to download MSPU.
At least every 25 hrs (PMS)
What happens before you get a Vibe light in the cockpit?
If a gearbox exceeds a CI (condition indicator) it gets looked at for 45 seconds. MSPU does this 3 times before activating a light. So all total it gets at least 2 min 15 sec.
Phasing the M/R blades aligns the 4 main rotor blade assemblies to?
Each other
Where is the blade phasing tgt installed?
On the tip cap of the blade being aligned.
What is the function of the phasing tool?
Provides mounting support for the laser
What is significant about pockets 0-3?
Avoid bending the tabs here unless your setting them back to 0
The M/R adjustments available for control of 1 P vibration are?
Pitch links, hub weights, and blade tabs.
During ground run track and balance pitch link adjustments used to control track spread will also affect?
Lateral and vertical vibration
What are M/R tab adjustments primarily used for?
To reduce 1 per rev vertical vibration in fwd flight with a secondary objective of reducing track spread.
When should the autorotation rpm verification be done?
As soon as the aircraft is capable of fwd speed of 80-100 KTAS
When should a PCL be adjusted for rpm?
If actual rpm is lower than the limits of the chart, or more than 3% above the limit.
