Airworthiness Directive · Amendment 39-21912 · Landing gear system
Gulfstream Aerospace Corporation Airplanes
This AD applies to all Gulfstream Aerospace Corporation Model G-IV airplanes, certificated in any category.
The FAA is superseding Airworthiness Directive (AD) 2020-12-06 for all Gulfstream Aerospace Corporation (Gulfstream) Model G-IV airplanes. AD 2020-12-06 required replacing the nose wheel steering servo valve manifold, incorporating revised operating procedures into the airplane flight manual (AFM), doing a records inspection for any incidents of un-commanded nose wheel steering turns, and reporting the results to the FAA. Since the FAA issued AD 2020-12-16, the FAA determined that a typographical error was made in citing one of the AFM documents. This AD retains the actions of AD 2020-12-06 and corrects the citation to the AFM. The FAA is issuing this AD to address the unsafe condition on these products.
This paragraph restates the requirements of paragraphs (g)(1) and (2) of AD 2020-12-06. Within 30 days after July 20, 2020 (the effective date of AD 2020-12-06), revise your airplane flight manual (AFM) by incorporating the revision applicable to your airplane configuration as listed in paragraphs (g)(1) and (2) of this AD:
(1) Gulfstream IV Airplane Flight Manual, Gulfstream Aerospace Document Number GAC-AC-GIV-OPS-0001, Revision 52, dated October 30, 2017; or
(2) Gulfstream G300 Airplane Flight Manual, Gulfstream Aerospace Document Number GAC-AC-G300-OPS-0001, Revision 20, dated October 30, 2017.
Within 30 days after the effective date of this AD, revise your AFM by incorporating Gulfstream G400 Airplane Flight Manual, Gulfstream Aerospace Document Number GAC-AC-G400-OPS-0001, Revision 20, dated October 30, 2017, if applicable to your airplane configuration.
This paragraph restates the requirements of paragraph (h) of AD 2020-12-06 with no changes. Within 36 months after July 20, 2020 (the effective date of AD 2020-12-06), replace the nose wheel steering servo valve manifold with nose wheel steering servo valve manifold part number 5100-11 or 5105-5 in accordance with the Accomplishment Instructions of the customer bulletin that applies to your airplane configuration as listed in paragraphs (i)(1) through (3) of this AD, except you are not required to comply with step H:
(1) Gulfstream IV Customer Bulletin Number 244, dated March 12, 2018;
(2) Gulfstream G300 Customer Bulletin 244, dated March 12, 2018; or
(3) Gulfstream G400 Customer Bulletin 244, dated March 12, 2018.
This paragraph restates the requirements of paragraph (i) of AD 2020-12-06 with no changes.
(1) Between 12 months and 24 months after the replacement of the nose wheel steering valve manifold assembly required in paragraph (i) of this AD, inspect all aircraft records for entries of an un-commanded nose wheel steering turn.
(2) Within 10 days after the records inspection required in paragraph (j)(1) of this AD, report the results of the inspection, regardless of whether the inspection found any entries, to the FAA by either email: 9-ASO-ATLCOS-Reporting@faa.gov; or by mail: Attn: Continued Operational Safety, Atlanta ACO Branch, FAA, 1701 Columbia Avenue, College Park, GA 30337. The report must include as much of the information listed in paragraphs (j)(2)(i) through (vii) of this AD as is known about the event:
(i) Date of records inspection;
(ii) Date and time of all un-commanded occurrences (if any);
(iii) Airplane serial number;
(iv) Weather and runway conditions at the time of each occurrence;
(v) Copy of the pilot's report of the occurrence (if available);
(vi) Maintenance entry of the root cause of the un-commanded deflection (if available); and
(vii) Any other information pertinent to the occurrence.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
