AD 90-05-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Tracor Aerospace, Inc. | Navigation Systems | Airworthiness Directives; TRACOR AEROSPACE, INCORPORATED TA-7800 Omega/VLF Navigation Systems, with Receiver Processor Unit (RPU) |
Unsafe Condition
Navigation errors when using the Great Britain (GBR) radio station could result in loss of the aircraft.
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Required Actions
Fabricate or install a placard on the TA-7800 Omega/VLF Navigation Control Display Unit (CDU) and deactivate the GBR VLF radio station prior to each flight within 10 hours' time in service. Replace the RPU software within 90 days after the effective date and update the AFMS with the software verification procedure, replace the pilot guide, and log the compliance.
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Compliance Time
Within the next 10 hours' time in service and within 90 days after the effective date of this AD.
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Affected Aircraft
TRACOR AEROSPACE, INCORPORATED TA-7800 Omega/VLF Navigation Systems with RPU Part Numbers 138000-7004, -7007, -7017, -7114, -7115, -7117, -7124, -7125, -7127, -7204, -7224, -7227, and -7247 with software 851001 or 851002 installed in specified airplanes via certain STCs.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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