{"id":"F2007L02374","name":"AD/G1159/49 - Elevator and Aileron Actuator Damper Shafts","slug":"ad-g1159-49-elevator-and-aileron-actuator-damper-shafts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":67737,"registerId":"commonwealth-F2007L02374-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Gulfstream (Grumman) G1159 and G-IV Seri","sectionType":"division","heading":"Gulfstream (Grumman) G1159 and G-IV Series Aeroplanes","content":"### Gulfstream (Grumman) G1159 and G-IV Series Aeroplanes\n\n| AD/G1159/49 | Elevator and Aileron Actuator Damper Shafts | 9/2007 |\n| ----------- | ------------------------------------------- | ------ |\n\n```html\n

Applicability:

Gulfstream Model GV series and Model GV-SP series aeroplanes having serial numbers (S/Ns) 5001 through 5052 inclusive.

Requirement:

Service Information References

The term \"customer bulletin,'' as used in this AD, means the Accomplishment Instructions of the applicable Gulfstream customer bulletins specified in Table 1 of this AD. Although the customer bulletins recommend completing and submitting the Service Reply Card or reporting compliance with the customer bulletin, those actions are not required by this AD.

Table 1. - Applicable Gulfstream Customer Bulletins

For

For model

Use

Dated

(1) Initial/repetitive inspections of and corrective actions for identified subject actuators.

(i) GV-SP series aeroplanes

Gulfstream G500 Customer Bulletin 4

23 August 2004.

(ii) GV-SP series aeroplanes

Gulfstream G550 Customer Bulletin 4

23 August 2004.

(iii) GV series aeroplanes

Gulfstream GV Customer Bulletin 123

23 August 2004.

(2) Terminating replacement of subject actuators.

(i) GV-SP series aeroplanes

Gulfstream G500 Customer Bulletin 6

8 December 2004.

(ii) GV-SP series aeroplanes

Gulfstream G550 Customer Bulletin 6

8 December 2004.

(iii) GV series aeroplanes

Gulfstream GV Customer Bulletin 124

8 December 2004.

1. Do a one-time inspection of the left and right aileron and elevator actuators to determine the part number (P/N) and S/N of each actuator, in accordance with the applicable customer bulletin.

\n```\n\n| | 2. If no actuator with a P/N and S/N listed in Table 1 \"Serial Number Effectivity Table'' of the applicable customer bulletin is identified during the inspection detailed in Requirement 1 of this AD, no further action is required by this AD, except as detailed in Requirement 5 of this AD.3. For any actuator identified during the inspection detailed in Requirement 1 of this AD with a P/N and S/N listed in Table 1 \"Serial Number Effectivity Table'' of the applicable customer bulletin, and for actuators for which the P/N or S/N is missing or unreadable:a. Do a detailed inspection of the identified actuator to detect a broken damper shaft, in accordance with the applicable customer bulletin.For the purposes of this AD, a detailed inspection is: \"An intensive examination of a specific item, installation, or assembly to detect damage, failure, or irregularity. Available lighting is normally supplemented with a direct source of good lighting at an intensity deemed appropriate. Inspection aids such as mirror, magnifying lenses, etc., may be necessary. Surface cleaning and elaborate procedures may be required.''b. If no damper shaft is found broken, Repeat the inspection detailed in Requirement 3a. of this AD.c. If any damper shaft is found broken, do the action specified in Requirement 3c.(i), 3c.(ii) or 4 of this AD, in accordance with the applicable customer bulletin.(i) Replace the actuator with a new or serviceable actuator having a P/N and S/N listed in Table 1 \"Serial Number Effectivity Table'' of the applicable customer bulletin, provided the new or serviceable actuator has been inspected in accordance with the Requirement 3 of this AD. Thereafter, repeat the inspection detailed in Requirement 3 of this AD for that actuator.(ii) Replace the actuator with a new or serviceable actuator having a new P/N listed in Table 2 \"Retrofit Part Number Replacement Table'' of the applicable customer bulletin. This replacement terminates the requirements detailed in Requirement 3 of this AD for that actuator only.4. Replace all identified suspect actuators with new or serviceable actuators having a new P/N listed in Table 2 \"Retrofit Part Number Replacement Table'' of the applicable customer bulletin. This replacement terminates the requirements of this AD, except as detailed in Requirement 5 of this AD. |\n| --- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n| | 5. Do not install an aileron or elevator actuator having a P/N and S/N specified in the applicable customer bulletin on any aeroplane, unless the actuator has been inspected according to Requirement 3 of this AD.6. Special flight permits are not allowed if any broken damper shaft is found during any inspection detailed in Requirement 3 of this AD.Note: FAA AD 2006-11-03 Amdt 39-14607 dated 15 May 2006 refers. |\n| ----------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Compliance: | 1. Within 500 flight hours after the effective date of this AD, unless previously accomplished.2. From the effective date of this AD.3. a. Before further flight, after the effective date of this AD.b. Repetitively at intervals not to exceed 500 flight hours, until the terminating replacement specified in Requirement 4 of this AD is accomplished.c. Before further flight, after the effective of this AD.(i) Repetitive inspection at intervals not to exceed 500 flight hours, until the terminating replacement specified in Requirement 4 of this AD is accomplished.4. Within 12 months after the effective date of this AD.5. From the effective date of this AD.6. From the effective date of this AD. |\n| | This Airworthiness Directive becomes effective on 30 August 2007. |\n| Background: | This AD results from reports of broken or cracked damper shafts within the aileron and elevator actuator assemblies. The issuing of this AD is to prevent broken damper shafts, which could result in locking of an aileron or elevator actuator (hard-over condition), which would activate the hard-over protection system (HOPS), resulting in increased pilot workload and consequent reduced controllability of the aeroplane. |\n\n![](image.001.png) \nDavid Punshon \nDelegate of the Civil Aviation Safety Authority\n\n26 June 2007","sortOrder":0},{"sectionNumber":"AD/G1159/49","sectionType":"part","heading":"AD/G1159/49","content":"## AD/G1159/49","sortOrder":1},{"sectionNumber":"Elevator and Aileron Actuator Damper Sha","sectionType":"part","heading":"Elevator and Aileron Actuator Damper Shafts","content":"## Elevator and Aileron Actuator Damper Shafts","sortOrder":2},{"sectionNumber":"9/2007","sectionType":"part","heading":"9/2007","content":"## 9/2007","sortOrder":3}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"flash_summary":{"complexity_score":6,"scope_assessment":{"changed":false,"description":"The text itself sets a clear, self‑contained scope (Gulfstream GV/GV‑SP S/Ns 5001–5052) and prescribes inspections, repeat intervals and terminating replacements. The document contains no indication that the scope has been widened or narrowed relative to an earlier instrument within the supplied text."},"complexity_factors":["Limited but specific applicability: only Gulfstream GV/GV‑SP aeroplanes S/Ns 5001–5052 (requires matching serials and part numbers)","Cross‑references multiple Gulfstream customer bulletins and two different tables (serial number effectivity and retrofit P/Ns)","Outcome‑dependent branching: actions differ if P/N/S/N present, missing/unreadable, or if a broken shaft is found","Mixed compliance timings: initial 500 flight hours, before‑further‑flight mandates, 500‑flight‑hour repeat intervals, and a 12‑month terminating replacement","Prohibition rules: installation ban on listed actuators unless inspected, and prohibition of special flight permits when a broken shaft is found","Technical inspection standard: 'detailed inspection' requires augmented lighting and inspection aids, increasing labour/time per check","Replacement options include either inspected serviceable units (which still require ongoing inspection) or retrofit parts that terminate repetitive inspections","Operational burden on operators to identify unreadable or missing P/N/S/N and treat them as suspect, adding inspection and replacement costs"],"plain_english_summary":"This Airworthiness Directive requires operators of Gulfstream GV and GV‑SP aeroplanes (S/Ns 5001–5052) to inspect left and right aileron and elevator actuators for listed part and serial numbers, carry out detailed inspections for broken damper shafts, repeat inspections every 500 flight hours until retrofit, and replace suspect actuators with designated retrofit parts within 12 months. It forbids installing listed actuators unless inspected and disallows special flight permits if a broken damper shaft is found. The AD aims to prevent damper‑shaft failures that can trigger hard‑over protection and reduce controllability."},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This is a standard Airworthiness Directive with a focused, narrow scope. It addresses a specific safety defect in specific aircraft models. There is no evidence of scope creep; the directive remains tightly focused on the damper shaft issue in the specified Gulfstream aircraft series."},"complexity_factors":["Multiple cross-references to external Gulfstream Customer Bulletins (6 different bulletins referenced by number and date)","Nested conditional logic: inspection → identification → detailed inspection → replacement options → terminating vs non-terminating actions","Specific part number and serial number tracking requirements (Table 1 and Table 2 references)","Multiple compliance timelines depending on which requirement is triggered (500 flight hours, 12 months, 'before further flight')","Technical aviation terminology requiring specialised knowledge (actuators, damper shafts, hard-over condition, HOPS)","Definition of 'detailed inspection' embedded within the text rather than in a definitions section","Exceptions to requirements (Requirement 2 allows early termination of obligations if parts not identified)"],"plain_english_summary":"Owners and operators of Gulfstream Model GV and GV‑SP jets (S/N 5001–5052) must inspect left/right aileron and elevator actuator damper shafts because cracking can cause actuator lock‑up and hard‑over protection, degrading controllability. Affected actuators found must be inspected and replaced if broken, with repeated checks every 500 flight hours until upgraded parts are fitted; installing uninspected units is prohibited and aircraft with broken shafts cannot be flown."}},"importantCases":[],"_links":{"self":"/api/acts/ad-g1159-49-elevator-and-aileron-actuator-damper-shafts","history":"/api/acts/ad-g1159-49-elevator-and-aileron-actuator-damper-shafts/history","analysis":"/api/acts/ad-g1159-49-elevator-and-aileron-actuator-damper-shafts/analysis","conflicts":"/api/acts/ad-g1159-49-elevator-and-aileron-actuator-damper-shafts/conflicts","importantCases":"/api/acts/ad-g1159-49-elevator-and-aileron-actuator-damper-shafts/important-cases","documents":"/api/acts/ad-g1159-49-elevator-and-aileron-actuator-damper-shafts/documents"}}