AD 2005-04-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Gulfstream | GV-SP | Airworthiness Directives; Gulfstream Model GV-SP Series Airplanes |
| engine | Honeywell | Primus Epic system to correct a display blanking problem | Airworthiness Directives; Gulfstream Model GV-SP Series Airplanes |
Unsafe Condition
A software error on the Honeywell Primus Epic system can cause a temporary loss of data from the cockpit display units, reducing flightcrew situational awareness and potentially leading to loss of control. Noise interference on the avionics standard communication bus (ASCB) can interfere with display recovery after a blanking event, extending the time the displays remain blank.
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Required Actions
Inspect the avionics standard communication bus (ASCB) for noise interference and repair it if found. Revise the airplane flight manual (AFM) to prohibit dispatch with the integrated standby flight display (SFD) inoperative, add procedures for recovering blank cockpit displays, and include flightcrew briefings on using standby instruments. Install an avionics software update and a hardware upgrade to the Honeywell Primus Epic system to address the display blanking issue.
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Compliance Time
Within 60 days of the effective date
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Affected Aircraft
Gulfstream Model GV-SP series airplanes
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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