Performance & Systems Flashcards
Hover Chart Area A
Hover performance from which controlability has been demonstrated in sideward/rearward relative wind conditions up to 20 mph
Hover Chart Area B
Hover performance in calm winds or winds outside the critical relative wind azimuth area (050°-210°)
Hover Chart Critical wind azimuth area
Winds 050°-210° hinders t/r
(requires more power to counter Tq & wind)
Winds outside helps t/r
(requires less power to counter Tq)
Power Check
Min Tq that must be avail to meet min eng specs
Power Check
In hover, level flight, or 60 mph climb
Anti ice and generator off
Raise collective to max TOT of 810°C or max TQ of 100%
Record OAT,ALT,TOT,TQ
Actual Tq must be ≥ chart Tq to be acceptable
Power Check vs Temperature
Cold Day Tq limits TOT
Hot Day/high alt TOT limits Tq
Deceleration Check - Roll off throttle
N2/Nr needles split & N1 100% to idle
Failure within 3 sec indicates sprag clutch seizure
Tach Gen
Shaft inside produces electrical alternating current relative to the speed of N1, N2, or NR which is relayed to the gauge
no need for gen or battery power, as the tach gen produces it’s own current
Chip Detectors Location
2 trans, 2 turbine, 1 fwu, 1 trgb
Chip Detectors
On Illumination, remove, inspect, clean, & reinstall - Ground run for 30 min
No Illumination - OK to fly
Yes Illumination - Grounded
On Illumination, remove, inspect, clean, & reinstall - Ground run for 30 min
No Illumination - OK to fly
Yes Illumination - Grounded
Illumination again within 8 flight hours - Grounded
Hydraulic Bypass System 1 of 4
Check hydraulic switch on
Solenoid is de-energized (off)(SW on CB in)
Hydraulic assist is on
Hydraulic fluid flowing through system
Hydraulic Bypass System 2 of 4
Pull hydraulic CB out
Removes power to solenoid
System has fail-safe mode to ON (solenoid off)
If cause is electrical, Hydraulic assist should be restored & Hydraulic fluid should flow through system
Hydraulic Bypass System 3 of 4
If no change Push hydraulic CB in
Power restored to solenoid
Solenoid is de-energized (off)
Hydraulic assist should be on
Hydraulic fluid should flow through system
Hydraulic Bypass System 4 of 4
If no change Turn hydraulic switch off
Solenoid is energized (on) Hydraulic assist is off Fluid is re-routed to reservoir Prevents hydraulic assist system from activating on final approach or landing
Tail Rotor Drive Shaft Witness Pin
Restricted movement indicates t/r drive shaft torque or twist stress
Hydraulic Actuator Bolts
Restricted movement indicates stress between flight controls and actuator control rods input flight control
– pressure from hydraulic actuator moves control rod attached to the desired control
Hydraulic Bypass Pin & A/F Oil Bypass Pin
Warns of dirty filter – senses build up of pressure due to blockage
reset once 30 min flight time prior to recheck
Engine Auto Relight
Actuated by the decay of engine bleed air as a result of flameout
also reads N1 Tach gen
no activation above 12,000’
Freewheel Unit Sprag Clutch
Metal sprags slightly longer than inner/outer diameter
With power engaged, sprags wedge between inner & outer and both turn together
In autorotation, inner drive shaft rpm is reduced (power off), but outer shaft is spun by inertia of the blades
The sprags between the two become un-wedged and allows the outer to turn freely
