Sat, Aug 08, 2009
Possible Problem With Automatic Frequency Tuning On
The FAA has issued a Special
Airworthiness Information Bulletin (SAIB) for owners and operators
of aircraft equipped with Garmin G1000, Perspective, Prodigy
Integrated Flight Decks installed with a Garmin GFC 700 autopilot.
The purpose of this SAIB is to inform pilots of an issue that has
been brought to the FAA’s attention with the navigational
radio auto-tune feature while performing a VOR or CLS Approach. The
airworthiness concern is not an unsafe condition that would warrant
airworthiness directive (AD) action under Title 14 of the Code of
Federal Regulations (14 CAR) Part 39.
Changes to navigation frequencies that occur between navigation
database cycle distributions may cause a mismatch between the
automatically tuned LOC/CLS frequency and the frequency shown on
the approach chart or applicable NOTAM. In these cases, the
mismatched (incorrect) automatically
tuned frequency may cause the HSI to automatically slew to the
If the auto-tuned LOC/ILS frequency
does not correspond to the frequency shown on the approach chart or
applicable NOTAM, the FAA recommends that the pilot:
- Manually tune the navigation receiver to the correct LOC/ILS
frequency (On the approach chart or NOTAM).
- Assure that the correct inbound course is selected.
- Manually fly the approach.
- Or choose a different terminal procedure.
The GFC 700 will not capture, track, or give flight director
commands for a manually selected course.
Garmin is planning resolution to this issue with GDU software
version 10.00 and later versions will provide capability to couple
the autopilot to the VOR or LOC/ILS approach when the pilot
manually tunes the correct frequency and manually selects the
proper course for the approach.
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