Airworthiness directives › 2012-25-07
AD 2012-25-07 Airworthiness Directives; Gulfstream Aerospace Corporation Airplanes
Models named: GIV-X. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Gulfstream Aerospace Corporation Model GIV-X airplanes, certificated in any category, serial numbers 4001 through 4271 inclusive.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Within 3 days after the effective date of this AD, perform an SPOST of the FSECU, in accordance with the applicable service information identified in paragraph (h)(1) or (h)(2) of this AD. (1) For Model GIV-X (G350) airplanes: Use Gulfstream G350 Alert Customer Bulletin 11, dated December 4, 2012, excluding Service Reply Card, dated December 4, 2012, and excluding Revision 31, dated December 4, 2012, of the Gulfstream G350 Airplane Flight Manual Document GAC-AC-G350-OPS-0001. (2) For Model GIV-X (G450) airplanes: Use Gulfstream G450 Alert Customer Bulletin 11, dated December 4, 2012, excluding Service Reply Card, dated December 4, 2012, and excluding Revision 33, dated December 4, 2012, of the Gulfstream G450 Airplane Flight Manual Document GAC-AC-G450-OPS-0001.
Unsafe condition
This AD was prompted by reports indicating that the flap/stabilizer electronic control unit (FSECU) does not detect failures of the brake feature within the horizontal stabilizer electric motor unit (HSEMU), or failures of the drive solenoids for hydraulic valves within the flap hydraulic control module (FHCM) during the system power-on self test (SPOST). We are issuing this AD to detect and correct such failures, which could result in runaway horizontal stabilizer pitch trim system and consequent loss of pitch control.
Affected ADs
None.
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1