UH-72 RFM Flashcards
Define Height-Velocity Envelope
5.1.9
The diagram shows the area which is critical for helicopter operation in the event of a single engine failure during takeoff, landing, or other operation near the ground.
The curves are applicable for landing sites with smooth firm surfaces and define the conditions in which a safe landing can be made after an engine suddenly becomes inoperative.
Rotor brake limitations
9.2-58-3 2.1
The rotor brake shall not be applied until both engines are shut down and rotor RPM has dropped below 50%
Do not apply the rotor brake at temperatures below -30°C
Allow for a minimum cooling period of 10 minutes before next application of rotor brake
NOTE if an emergency stop of the rotor is necessary, apply rotor brake anytime after both engines are shut down. Before next application of the rotor brake after an emergency stop, maintenance action is required.
Maximum autorotation airspeed and maximum range airspeed
3.4.18
90 KIAS
Minimum autorotation airspeed and minimum rate-of-descent airspeed
3.4.18
60 KIAS
Maximum forward airspeed with hinged doors in open spoiler position and sliding doors closed, open or removed is______ KIAS or VNE whichever is less.
9.1-2-4 2.3
100 KIAS
Minimum height for hands-off and feet-off operation during T/O and approach
9.2-1-12 2.3
200 ft AGL
Minimum height for hands-off and feet-off operation in cases other than T/O and approach
9.2-1-12 2.3
500 ft AGL
Rotor RPM warning conditions/indications
3-9 3.2.1
NRO low - 95% or less, steady light and low pitch beeping tone
NRO high - 106% or above, flashing light and warning gong
NRO high- 110% or above, flashing light and steady high pitch tone
Airspeed limit AEO FLI
2.11
65 knots if above 8.5 of the FLI
In NORM mode the VARTOMS will automatically control rotor speeds as follows
7.13.1
- Low airspeed below 55kts 101% to 103.5%
- Airspeeds 55kts or higher 96.5% to 102%
What are the “Abort Start” criteria?
4.4.2
ITON
Ignition doesnt take place in 15 seconds (320° C TOT)
TOT rise above limits
No postive ENG/XSMN Oil pressure upon reaching ground idle conditions
N2 and NR needles are not matched upon reaching ground idle conditions
The three basic rules of inflight emergencies
3.1.1
MAT
- Maintain aircraft control
- Analyse the situation
- Take proper action
How high is the bottom of the tail rotor blade from the ground?
7.5 Figure 7-1
6.5 feet
What is the diameter of the rotor disc?
7.5 Figure 7-1
36 feet 1 inch
When does engine overspeed protection disrupt fuel flow and kill the engine?
7-16 7.8.3
Approximately 123% N2
What determines flight status?
7-45 7.20.6.1
N1 ENG 1 or 2 >50% and
XMSN pressures 1 or 2 >1 bar and
TQ1 + TQ2 >50%
Minimum AS for IAS mode?
9.2-1-12 2.2
30 KIAS
NOTE in ALT mode below 80 KIAS the airspeed indicator shall be monitored closely.
SEMA normal control authority
9.2-1-85 7.2.2
11% Pitch
18% Roll
12% Yaw
Backup SAS
5.5% Pitch
9% Roll
12% Yaw
When do VARTOMS automatically become activated?
7.13
As soon as both engines reach 20% torque
An engine failure or torque split of _____ the VARTOMS will automatically switch to MAN- mode
7.13.1.4
15%
When does ENG SPLIT caution appear?
3-18 3.2.3
N1 indicators show difference of 10% or more
Engine Oil Pressure NOTE
2.12.1
Exceeding 5.0 bar oil pressure is allowed for transient operation during the start cycle and warm up at ground idle only
XMSN OIL PRESS NOTE
2.12.5
XMSN OIL PRESS warning light illumination is acceptable in the range from 1.0 to 1.4 bar during the pressure build-up phase.
What are the blades made of?
7.1
Fiber-reinforced composite blades
Maximum displacement of cyclic during ground run-up?
4.13.1
3 cm
