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Use of Collective ..............................................11-9
Precautions ........................................................11-9
Low G Conditions and Mast Bumping ...............11-10
Low Rotor RPM and Blade Stall ........................11-10
Recovery From Low Rotor RPM........................11-10
Systems Malfunctions..........................................11-11
Antitorque System Failure ..............................11-11
Landing—Stuck Left Pedal........................11-11
Landing—Stuck Neutral or
Right Pedal .................................................11-12
Unanticipated Yaw / Loss of Tail Rotor
Effectiveness (LTE) ........................................11-12
Main Rotor Disc Interference
(285-315°) .......................................................11-12
Weathercock Stability
(120-240°) .......................................................11-13
viii
Tail Rotor Vortex Ring State
(210-330°) .......................................................11-13
LTE at Altitude...........................................11-13
Reducing the Onset of LTE .......................11-13
Recovery Technique...................................11-14
Main Drive Shaft Failure ................................11-14
Hydraulic Failures...........................................11-14
Governor Failure.............................................11-14
Abnormal Vibrations.......................................11-14
Low Frequency Vibrations.........................11-15
Medium and High Frequency
Vibrations ...................................................11-15
Tracking and Balance ................................11-15
Flight Diversion...................................................11-15
Lost Procedures ...................................................11-16
Emergency Equipment and Survival Gear ..........11-16
Chapter 12—Attitude Instrument Flying
Flight Instruments .................................................12-1
Pitot-Static Instruments ....................................12-1
Airspeed Indicator........................................12-1
Instrument Check.........................................12-1
Altimeter ......................................................12-2
Instrument Check.....................................12-2
Vertical Speed Indicator....................................12-2
Instrument Check.........................................12-2
System Errors...............................................12-2
Gyroscopic Instruments ....................................12-3
Attitude Indicator.........................................12-3
Heading Indicator ........................................12-3
Turn Indicators.............................................12-4
Instrument Check.........................................12-4
Magnetic Compass............................................12-4
Compass Errors............................................12-4
Magnetic Variation.......................................12-4
Compass Deviation..................................12-5
Magnetic Dip ...........................................12-5
Instrument Check.....................................12-5
Instrument Flight ...................................................12-5
Instrument Cross-Check ...................................12-5
Instrument Interpretation ..................................12-6
Aircraft Control ................................................12-7
Straight-and-Level Flight..................................12-7
Pitch Control ................................................12-7
Attitude Indicator.....................................12-8
Altimeter ..................................................12-8
Vertical Speed Indicator ..........................12-8
Airspeed Indicator ...................................12-9
Bank Control................................................12-9
Attitude Indicator.....................................12-9
Heading Indicator ..................................12-10
Turn Indicator ........................................12-10
Common Errors During
Straight-and-Level Flight ...........................12-10
Power Control During
Straight-and-Level Flight ...........................12-11
Common Errors During
Airspeed Changes.......................................12-11
Straight Climbs (Constant Airspeed
and Constant Rate)..........................................12-11
Entry...........................................................12-12
Leveloff......................................................12-14
Straight Descents (Constant Airspeed and
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