Instrument Flight
Basic Instrument Maneuvers
You will find it more difficult to exercise fine aircraft control because of the standby AI’s smaller size. It will
move a smaller distance for a given control input even though the actual attitude indications are the same.
Unlike the ADI, the standby AI provides only nose and wing attitude information. If you lose the ADI, you
can get ILS and heading information from the HSI, but turn rate indications may no longer be available.
The loss of the turn needle means that you will have to fly a specific bank angle at a given airspeed to
maintain 1/2 standard rate and standard rate turns (refer to the section on turn and slip indictor failure
above). Because all heading information will be provided by the HSI, you will have to give it greater
emphasis in your scan. The CDI and glideslope pointer on the HSI will become your primary course and
glideslope references for an ILS approach.
COMMON ERROR: Be careful not to overcontrol the aircraft. The small size and different location of the
AI may cause you to rely more on the performance instruments than you would under full panel
conditions, so you may tend to “chase” your remaining performance instruments.
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