Street’s NATOPS Chapter 7 Post Preflight HSM-50

Question 1

If RMCU ENABLE/DISABLE is in DISABLE position when MSN PWR turned on,

Answer 1

TA will not indicate SEATED even if it is

Question 2

Conditions when stab may autoprogram

Answer 2

During high wind conditions (winds greater than 30 knots) and with AC power supplied, the stabilator can automatically program. If the stab is folded, damage may occur. Consideration should be given to disengaging stab auto mode while the stab is folded.

Question 3

After turning battery on, pilot station is hardwired to

Answer 3

V/UHF rado 1 via RCU.

Question 4

to prevent APU exhaust fire, wait at least ___ after APU shutdown to attempt restart to allow residual fuel to vaporize

Answer 4

2 minutes

Question 5

if APU shuts down during start or after running, do not ___ because ___

Answer 5

cycle BATT switch or turn off APU CTRL switch; it will remove cause of shutdown from APU BITE indicator

Question 6

head check shall be conducted any time

Answer 6

BLADEFOLD switch is moved from OFF position

Question 7

if PYLON FLIGHT light is not illuminated

Answer 7

pylon and stabilator lockpins and tail rotor indexer shall be visually inspected prior to flight. (DEMOT may have to extend pins to trigger switches).

Failure to visually inspect the pylon and stabilator lock pins and the tail rotor indexer may cause separation of the tail pylon.

Question 8

hover altitude caret will not display until

Answer 8

mission comptuer has taken control

Question 9

while performing CHIP IBIT

Answer 9

28 VDC is interrupted

Question 10

during CHIP IBIT, WCAs and MASTER CAUTION will not correctly respond for

Answer 10

approx 40 seconds

Question 11

CHIP IBIT will not function without

Answer 11

primary and backup computer on

Question 12

on Fuel Quantity Test, should see

Answer 12

total fuel decreases to 0 (if external tank installed, total fuel will read what’s in external tank), #1/#2 FUEL LOW, MASTER CAUTION.

Indicators return to previous quantity after releasing pushbutton.

Question 13

Good RadAlt Test

Answer 13

RadAlt tone 5 +/- 1 beeps, indicator reading 100 +/- 10 ft for 5 seconds, yellow tape up to DH setting or 100 ft, whichever is lower.

Performing a RADALT test prior to the primary computer being online may cause the RADALT to be stuck at the test altitude and will require restart of the primary computer.

Question 14

Good TACAN Test

Answer 14

BRG 1 needle 180 +/- 3 deg for 5 sec, DME 0.0 nm (+/- 0.5 nm), NAV needle centering (within 1/2 dot), a TO (if 180)/FROM (360) indication

Question 15

Good Transponder Test

Answer 15

Absence of IFF cautions or advisories

Question 16

Tail Rotor Servo Check

Answer 16

#1 TR SERVO
#2 TR SERVO ON
BKUP
MASTER CAUTION
no binds or restrictions while moving pedals

Question 17

AFCS Ground Checks Allowable movement

Answer 17

SAS 1/2 and trim - Minimal movement in flight controls acceptable
Autopilot - No movement in flight controls

Question 18

Helicopter shall not be flown if stab fails

Answer 18

any check involving manual operation, position indications, or warnings.

Without stab auto mode, careful aircrew coordination to manually slew the stab is required to avoid undesirable and potentially dangerous flight regimes and or aircraft attitudes.

Question 19

if stab auto mode fails to engage, ___ may align stab actuators and allow stab auto mode to reengage

Answer 19

slewing stab full up then full down with ac power.

Helicopter shall not be flown if the stabilator fails any check involving manual operation, position indications, or warnings.

Question 20

Np shaft rub occurs due to

Answer 20

asymmetric heating of Np shaft by a hot engine

Question 21

Np shaft rub definition

Answer 21

when rotor brake is released, Np shaft impacts Ng shaft causing compressor blades to impact casing

Question 22

an unguarded cyclic may allow rotor arc to dip as low as

Answer 22

4 ft

Question 23

if engine ignition is placed to NORM while start is in progress, __ may occur

Answer 23

hot start

Question 24

it is normal for OIL FLTR BYPASS caution and/or high engine oil pressure to appear when

Answer 24

starting an engine below normal operating temps because of realtively high oil viscosity

Question 25

Engine oil temp caution should disappear when engine oil reaches __ deg C

Answer 25

38

Question 26

Ng will not indicate until __ %

Answer 26

6

Question 27

Ground idle Ng split greater than __ is an indication of possible __. Do not fly until maintenance action is performed

Answer 27

3; possible rollpin failure

Question 28

Engine Overspeed Test failure while testing A or B individually will

Answer 28

give same indications as a normal test of A and B simultaneously

Question 29

During the C power check, a rapid rise in TGT may indicate what?

Answer 29

An engine control system malfunction

Question 30

Hyd leak test lights

Answer 30

#1 TR Servo
#2 TR Servo On
Backup Pump On
#1 RSVR Low
#2 RSVR Low
Backup RSVR Low
SAS
Boost Servo Off
AFCS Degraded
Master Caution

Question 31

Tail Rotor Servo Check (Post Engagement Checks)

Answer 31

#1 TR Servo and Master Caution come on
Within 1.5 seconds, get:
#2 TR Servo On and BKUP Pump On

Question 32

If electrical loads are introduced while on APU gen or external power, AFCC power sever may occur and cause ___ to appear

Answer 32

AFCS degraded

Question 33

If droop stops not out by 100% Nr

Answer 33

Shutdown and investigate

Question 34

Stab Check

Answer 34

1. Check 34-42
2. Test button - stab moves 5 to 12 deg up +warning/tone
3. Auto control on - 34 to 42
4. Man slew - 5 to 10 trailing edge up in 4 to 8 sec
5. Man slew to 0
6. Auto on

Question 35

After start, if no xmsn oil px, ___

Zero oil px may indicate ___

Answer 35

shut down

A no oil flow condition –> damage to rotors if engaged for over 1 min

Question 36

Moving flight controls

Answer 36

Moving flight controls without first or second stage pressure on the primary servos may cause damage to the flight controls.

Question 37

RAST warning on takeoff

Answer 37

Failure to ensure the tail probe is manually retracted prior to takeoff from air capable ships may result in dynamic rollover.

Question 38

Spread for more than 5-7 seconds

Answer 38

With a malfunctioning micro switch or blade fold logic module, keeping the BLADEFOLD switch in spread for more than 5-7 seconds may cause the blade fold lock pins to fully retract, resulting in an uncommanded blade fold and possible damage to the a/c.

Question 39

Primary Servo ratcheting

Answer 39

With the collective in the full up position and the cyclic at the forward left corner of its movement envelope, a ratcheting may be felt through the cyclic and airframe and heard in the cockpit as the cyclic is moved to the right. This normal ratcheting of the swish plate uniball bearing on the star guide assembly will only occur at the specific flight control orientation and movement listed above.

Ratcheting or binding with the flight controls at any other position than collective full up and cyclic at the forward left corner indicates an unassociated control problem or deterioration of the Teflon coating on the uniball assembly.

Question 40

Warning while turning generators on:

Answer 40

Power transfer from the APU generator or external power to the No 1 generator may cause disengagement of SAS 1/2, TRIM, AUTOPILOT, and stab. An unguarded cyclic may allow the rotor arc to dip as low as 4 ft above the ground.

Question 41

Engine cooling on shutdown

Answer 41

Engines should be cooled for 2 minutes at an Ng of 90% or less before moving PCL to off. If an engine is shutdown without being cooled, it should not be restarted for 4 hours unless restart is performed within 5 mins.

Question 42

Postflight

Answer 42

Interior and exterior equipment
Tires and struts
Leaks
Missing panels

“ITLM”

Question 43

Requirements for alert launch checklist

Answer 43

All ground, prestart, systems, starting engines, rotor engagement, and shutdown checklists shall be completed prior to using the alert launch checklist.

Question 44

EDECU Fault Code 15

Answer 44

EDECU fault code 15 may result in an EDECU driven engine control failure, and subsequent engine damage.

Question 45

Fuel Dump restrictions

Answer 45

Fuel dumping should be manually terminated at no less than 600 lbs total fuel. Fuel dump checks shall be completed near a site at which a safe landing can be made in the event the fuel dump does not cease.

With less than 600 pounds of fuel, fuel starvation may occur when balanced flight is not maintained and or pitch attitudes exceed 15 degrees nose up or down.

Question 46

Engine Cleaning 60 Hour TGT

Answer 46

Will be 71 degrees higher than normal with ENG OVSPD CBS pulled (EDECU not powered).
Additionally, engine alternator power may be insufficient to power some EDECUs at maximum started speed (also 71 degrees higher).

Question 47

Low Ng Waterwash

Answer 47

If Ng decreases below 16% during engine cleaning, secure starter to prevent engine damage.