Scan Summary

T-34C INSTRUMENTS

CHAPTER TWO

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 Summary

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

general categories:

Straight and level.

ii.

Straight climb or descent.

iii.

Level turn, constant AOB or rated turn.

iv.

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.

ii.

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

flight.

iii.

Performance instruments must be included in a timely fashion to maintain

stability of performance.

BASIC INSTRUMENTS GENERAL PROCEDURES 2-7