Airworthiness directives › 2023-08-03
AD 2023-08-03 Airworthiness Directives; Gulfstream Aerospace Corporation Airplanes
Models named: G-1159A, G-1159B, G-IV, GIV-X. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to the Gulfstream Aerospace Corporation airplanes identified in paragraphs (c)(1) through (4) of this AD, certificated in any category. (1) Model G-1159A airplanes having serial numbers (S/Ns) 385, 387, 388, and 390 through 498 inclusive. (2) Model G-1159B airplanes having S/Ns 009, 016, 042, 048, 054, 064, 086, 088, 095, 098, 102, 119, 123, 125, 131, 140, 151, 154, 155, 156, 165, 166, 189, 198, 199, 207, 219, 237, 245, 254, 255, and 257. (3) Model G-IV airplanes, all serial numbers. (4) Model GIV-X airplanes, all serial numbers. Note 1 to paragraph (c): Some Model G-IV airplanes are also referred to by the marketing designations G300, G400, and GIV-SP. Note 2 to paragraph (c): Some Model GIV-X airplanes are also referred to by the marketing designations G350 and G450.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
For Model G-1159A, G-1159B, and G-IV airplanes: Within 18 months after the effective date of this AD, incorporate corrective actions (includes replacing a ground spoiler actuator hydraulic hose and associated fittings) that physically prevent improper connection of the hydraulic lines to the ground spoiler actuator, in accordance with a method approved by the Manager, Atlanta ACO Branch, FAA. Accomplishment of the actions specified in the applicable service information in paragraphs (g)(1) through (5) of this AD is acceptable for compliance with the requirements of this paragraph. (1) Gulfstream G300 Customer Bulletin No. 250, dated November 9, 2022. (2) Gulfstream G400 Customer Bulletin No. 250, dated November 9, 2022. (3) Gulfstream GII-GIIB Customer Bulletin No. 471, dated November 9, 2022. (4) Gulfstream GIII Customer Bulletin No. 189, dated November 9, 2022. (5) Gulfstream GIV Customer Bulletin No. 250, dated November 9, 2022.
Unsafe condition
This AD was prompted by a report that a Gulfstream Model G-IV airplane was involved in a fatal accident on December 15, 2021, after spoilers deployed in an asymmetrical manner. The asymmetrical spoiler deployment resulted in in-flight loss of control of the airplane. The fatal flight was the first flight after maintenance actions where the spoiler hydraulic lines were improperly connected (reversed) to the ground spoiler actuator. The ground spoiler actuator configuration does not preclude improper hydraulic line connections that could result in unintended asymmetrical spoiler deployment. The FAA is issuing this AD to prevent incorrect connection of the hydraulic lines to the ground spoiler actuator. The unsafe condition, if not addressed, could result in unintended asymmetrical spoiler deployment leading to loss of control of the airplane.
Affected ADs
None.
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