Climbing or Descending Turns
The primary attitude instrument for nose and wing position is the attitude gyro. Nose attitude is
crosschecked on the airspeed indicator and wing attitude is crosschecked on the AOB indexer
(ABI). If climbing or descending at a constant rate while in a constantrate turn, the
performance must be checked by comparing the altimeter and RMI against the clock. In the four
basic scan patterns discussed, there is a scan for every performance in normal flight conditions.
Scan is the selective and systematic visual interpretation of attitude and maneuver performance
crosscheck instruments, designed to provide the instrument pilot with an essentially realtime
awareness of the aircraft attitude. Effective scan is accomplished in a planned rhythmic
sequence for each of the major flight maneuvers.
All normal aircraft instrument flight maneuvers may be reduced to the following four
Straight and level.
Straight climb or descent.
Level turn, constant AOB or rated turn.
Climbing or descending turns.
Efficient Scan Patterns. The following guidelines will form the basis for the
development of effective, efficient scan patterns.
When scanning nose or wing position crosscheck instruments, as well as
performance or additional scan instruments, always recheck the attitude gyro for
proper attitude indication before moving onto the next crosscheck instrument.
This will keep your scan centered around the attitude gyro, which is the primary
reference for both nose and wing position.
Always scan the nose crosscheck instrument first after establishing and
trimming to hold the desired attitude on the attitude gyro, since nose attitude is
most critical. The other crosschecks will confirm wing position and balance of
Performance instruments must be included in a timely fashion to maintain
stability of performance.
BASIC INSTRUMENTS GENERAL PROCEDURES 2-7