ADI Failure - P-12850092

T-45C TS & ADV BIFP-09

Instrument Failures

The procedure for dealing with an HSI failure is:

Determine the nature of the malfunction.

Use backup navigation instruments as appropriate.

Report essential HSI failure to ATC.

Maintain VFR conditions, if possible

Land as soon as practicable.

ADI FAILURE 1.8.1.7.1.2

A digital display system does not manifest a failed ADI in the same context as a flight

director or older analog system. The ADI display page can be called up on multiple

MFD units in the two cockpits.

The ADI display page presents not only aircraft attitude data, but also heading, BARO

altitude, radar altitude, KIAS, TAS, AOA, Mach, g-loadings, vertical velocity, and turn/

slip information. Additionally, LAW and BINGO parameters can be set using this

display page and associated increment/decrement push-buttons.

Loss of the GINA will cause a loss of the aircraft attitude portion of the ADI display.

Loss of other instruments (e.g., radar altimeter) will result in the loss of associated

readouts on the ADI. Additionally, a stuck MFD push-button may just disable a

particular ADI function on that particular MFD unit. Switching the desired display to

another unit may resolve the difficulty.

As you know, there are no warning or OFF flags on the ADI display, other than AV BIT.

If a data or graphical image problem is suspected, four logical investigative steps should

be followed:

•

Be sure associated equipment that supplies the data in question is ON.

•

Be sure data has been properly entered: e.g., the proper ILS frequency is

needed for ILS steering, CDI mode is needed for both VOR and ILS.

•

Perform BIT checks on suspect equipment: e.g., radar altimeter, VOR/ILS.

•

Check the DATA display page for any OPGO/DEGD alerts and react

accordingly.

Normally, the ADI will be selected for display on the left MFD. To assure that an ADI

problem is not really an MFD problem, call up the ADI display on another MFD unit and

compare results.

(8-99) Original

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