Airworthiness Directive · Amendment 39-11680 · Gulfstream Model G-IV Series Airplanes
Gulfstream Model G-IV Series Airplanes
Model G-IV series airplanes, serial numbers 1000 through 1404 inclusive; certificated in any category.
Note 1: This AD applies to each airplane identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For airplanes that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (b) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it.
This amendment adopts a new airworthiness directive (AD) that is applicable to certain Gulfstream Model G-IV series airplanes. This action requires modification of the power feeder cable assemblies of the left and right engine alternators. This amendment is prompted by an incident of an in-flight engine fire on a Model G-IV series airplane due to chafing of the power feeder cable assembly of an engine alternator. The actions specified in this AD are intended to prevent interference and chafing between the alternator power feeder cables and adjacent structure, which could result in an electrical short circuit and consequent fire ignition source in the engine compartment.
To prevent interference and chafing between the alternator power feeder cables and adjacent structure, which could result in an electrical short circuit and consequent fire ignition source in the engine compartment, accomplish the following:
(a) Within 150 total flight hours after the effective date of this AD, accomplish paragraphs (a)(1) or (a)(2) of this AD, as applicable, in accordance with Gulfstream IV Customer Bulletin No. 112, dated February 15, 2000, and Gulfstream IV Aircraft Service Change No. 410, dated February 11, 2000.
(1) For airplanes having serial numbers 1000 through 1384 inclusive: Accomplish paragraphs (a)(1)(i) and (a)(1)(ii) of this AD for the left and right engines, in accordance with Paragraphs B. and C. of the Modification Instructions of the aircraft service change.
(i) Replace the alternator power feeder cables with new cables, and reroute the cables.
(ii) Install additional brackets and clamps.
Note 2: On some airplanes, some of the actions described in the aircraft service change were accomplished prior to the effective date of this AD. On these airplanes, these actions are not required to be repeated, as allowed by the phrase, “unless accomplished previously.” However, any action described in the aircraft service change that has not been accomplished on these airplanes must be accomplished in accordance with this paragraph.
(2) For airplanes having serial numbers 1385 through 1404 inclusive: Accomplish paragraphs (a)(2)(i) and (a)(2)(ii) on the right engine in accordance with paragraph D. of the Modification Instructions of the aircraft service change.
(i) Install a bracket and spacer.
(ii) Reroute the alternator power feeder cables.
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
