ADI DISPLAY FAILURE
Because the ADI display is the primary attitude, heading, airspeed, altitude, and VSI reference, losing part
or all of the ADI display forces you to significantly alter your instrument scan pattern. You will have to get
some or all of the information that was on the ADI display from the standby instruments and the HSI
display or HUD.
The first and most important step in dealing with an ADI display failure is to establish and maintain attitude
control by looking outside the cockpit (if possible) and referencing the standby AI. Also, bring the other
standby instruments into your scan, as required. The remainder of the attitude failure procedure is also
important, but this first step is vital. See the Partial Panel section of this FTI for further information.
The procedure for dealing with an ADI display
1. Use the standby attitude indicator (AI) for
2. Use other standby instruments as required.
3. Use the HSI display for your primary heading
4. Maintain VFR conditions, if possible.
5. Check the electrical system.
6. Report the instrument failure to ATC.
7. Land as soon as practicable.
The advisory window that is particularly pertinent
to the ADI is ATTITUDE. It is displayed when the
DEU senses attitude data transitions from valid to
invalid (Figure 50). Whenever you see the
ATTITUDE advisory window, immediately cross-
check outside the cockpit (if possible) and with
Figure 50: ATTITUDE ADVISORY LEGEND
the standby AI to determine actual aircraft attitude
and to maintain aircraft control.
TURN AND SLIP INDICATOR FAILURE
In the event that the ADI display turn needle or slip indicator fails, you will have to use the turn and slip on
the instrument panel. If both turn needles are inoperative, use bank angle and airspeed for 1/2 standard
and standard rate turns.
There is no specific procedure for a slip indicator malfunction because it is unlikely to fail unless it is
physically damaged and because it does not serve an important enough function to warrant any remedial
The procedure for dealing with a turn and slip indicator failure is:
1. Check the ADI display for correct indications.
2. Use the turn and slip indicator on the instrument panel.
3. Use the ADI display and airspeed for turn rate reference.