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AI disconnect for Spin training?

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Another subject, caging gyros while taxiing or airborne isn't good for the instrument as well.

If it is a flight school/rental aircraft and you are performing spins, don't worry about damaging the gyros because usually they are all shot to sh!t anyways.

Peace
 
Flydog,

Any time the flight requires a parachute, the PIC must wear it. You misread the regulation detailed in 14 CFR 91.307(c). Any time an aircraft is carrying someone other than a required crewmember, all occupants must wear parachutes if bank exceeds 60 degrees or pitch 30 degrees. The PIC is not exempt.

Often this is misinterpreted as meaning that all occupants other than required crewmembers must wear parachutes. However, if an person other than a required crewmember is carried, all occupants, including the crewmembers, must wear the parachutes under this subparagraph.

A field approval may be used to alter the vacum system. This is not a pilot function, but will require the signature of a certificated mechanic with an Inspection Authorization. Using a bypass or simply bypassing the instrument, but leaving it in the panel, does not prevent wear, but increases it.

Gyro instrument experience their greatest damage and wear sitting on the line, being shaken and moved when the wind blows. Another great source of wear is allowing the aircraft to be moved within approximately 45 minutes of shutdown. Few operators are aware of this. As the speed decays and the gyro destabilizes, an enormous amount of wear and potential damage occurs to the gimball bearings.

Something similiar occurs during aerobatic flight or rapid maneuvering with gyros. The force of precession on bearing surfaces wears unevenly, and hastens a premature death of the instrument. Caging the instrument doesn't change this, it only prevents the instrument from tumbling. The damage and wear still occurs.

Most gyros are not capable of flight through loops and rolls without tumbling, or without precession errors. The most common precession error may be induced with a steep or standard rate turn of 180 degrees. Even rapid turn entries can hasten or accelerate wear damage to the ruby bearing surfaces in gyros.

The excerpt from Modern Airmanship is misleading, as it applies to only some gyros.

A series of one turn spins can certainly damage a gyro. However, a one turn spin is still incipient, and doesn't represent effective or proper spin training. Any abrupt maneuvers can damage the gyro. Gyros are delicate, precision instruments. Treat them like powerplants and treat them with care like your life depends on them. It may.
 
Crewmember

Just to clarify, the regulations states that you must have a parachute if carrying a person "other than a crewmember," but does not say "other than a required crewmember." A crewmember is simply a person who is assigned a duty for the flight (FAR 1).

If you are carrying someone that is not a crewmember, then everyone has to wear a parachute.
 

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