Street’s NATOPS Chapter 7 Preflight HSM-50

Question 1

General things looking for on preflight

Answer 1

In each location, inspect for corrosion, FOD, condition, and security.

Check that all securing hardware is safety wired, cotter-keyed, and or slipmarked.

Plastic caps on avionics present a FOD hazard. Check for security.

If weapons are loaded, refer to technical manual for appropriate preflight instructions.

Question 2

Improper installation of LDS pins may result in/ how to verify

Answer 2

engine overspeed.

Proper installation of the LDS roll pin is indicated by the LDS roll-pin protruding from both sides of the LDS control cable rod and the collective bias tube with the safety wire intact.

Question 3

If black is visible on BIM indicator,

Answer 3

It may be an indication of blade damage.

The cause of a black BIM indication shall be determined prior to flight.

Question 4

In the engine, check

Answer 4

1) security of engine oil cap
2) No 1/2 oil level
3) deswirl duct clamps - secure
4) engine compartments
5) PDIs (eng oil filter and fuel filter)

Question 5

5 microswitches that set pylon FLIGHT light

Answer 5

1) left stab lockpin
2) right stab lockpin
3) monkey fist/tail rotor indexer
4) pylon lockpin
5) 5 degree switch

Question 6

type/cant of TR

Answer 6

tractor type, 20 degrees

Question 7

Hydraulic hand pump service reservoir:

Answer 7

Fluid level.
Hydraulic service valve selector pointed toward reservoir.
Cap secure.
Utility pump hydraulic service valve in vertical position.

Question 8

QD Warning

Answer 8

Failure to verify QD security may result in malfunction of pilot assist servos or loss of tail rotor control.

Ensure the outer sleeve of QD coupling completely covers the QD locking balls so they are not visible.

Question 9

Grounding wire warning

Answer 9

Failure to ensure grounding wire contacts the ground my result in electrical shock to personnel or equipment that come into contact with the aircraft.

Question 10

Overserviced tail gearbox/ tint

Answer 10

An over serviced tail gearbox and or a red tint to the tail gearbox oil are possible signs of contamination with hydraulic fluid. Failure of the tail rotor gearbox is possible.

Question 11

APU accumulator pressure

Answer 11

2650 PSI minimum

Question 12

Sonobuoy launcher pressure

Answer 12

1175 plus or minus 25 psi (with sonobuoys installed)