To practice the procedure for an in-flight governor failure.
- Discuss indications of a governor failure.
- Demonstrate the change in rotor noise that accompanies changes in RPMs.
- Practice cruising flight with the governor disengaged.
- Practice landing with the governor disengaged.
- Practice hovering/hover taxiing with the governor disengaged.
Instructional aids and pre-requisites
- Ground Lesson pre-requisite: Emergency Procedures and Flight Controls and Systems
- Lessons BM-1 through BM-8 are pre-requisites
- This lesson can be combined with Lesson PS-5 (Low rotor RPM recovery)
- Prior to take-off and with collective full-down, have the student close his eyes while the instructor increases and decreases throttle until the student perceives a change in noise
- Allow the governor to restore RPMs to the normal range and conduct a normal take-off
- In cruising flight, disable the governor
- Above 18 ˝ MAP the correlator will maintain engine RPMs as long as collective inputs are small and smooth, and the density altitude is low enough
- Before a large increase in collective setting, reduce the throttle to the lower part of the green range; as the collective is raised, the correlator will increase engine RPMs
- Before a large decrease in collective setting, increase the throttle to the upper part of the green range; as the collective is lowered, the correlator will reduce the engine RPMs
- On approach, anticipate the effect lowering the collective will have on engine RPMs and increase throttle to the upper part part of the green range
- When terminating the approach, anticipate the effect raising the collective will have on engine RPMs and reduce throttle
- While taxiing, making small, smooth collective inputs will reduce the need to make throttle corrections
- To set down, increase throttle to the top of the green range; slowly lower the collective
- To pick up, increase throttle to the bottom of the green range; slowly increase collective and reevaluate the throttle setting once established in a stabilized 5 ΄ hover
- Fixation on the tachometer
- Encourage the student to maintain a VFR scan that includes the tachometer, but to use engine/rotor noise to detect changes in RPMs
- Demonstrate that understanding how the correlator will adjust RPMs allows the pilot to anticipate RPM changes and make adjustments
- The student will be able to conduct a normal pattern, approach, landing, and taxi with the governor disabled
- RPMs maintained within the green range (101-104%)
- None specified
- Not applicable
- None specified