{"id":"F2007L03970","name":"AD/G164/19 Amdt 1 - Fuel Shut-Off Control - Modification","slug":"ad-g164-19-amdt-1-fuel-shut-off-control-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":70681,"registerId":"commonwealth-F2007L03970-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Schweizer (Grumman) G-164 (Ag-Cat) Serie","sectionType":"division","heading":"Schweizer (Grumman) G-164 (Ag-Cat) Series Aeroplanes","content":"### Schweizer (Grumman) G-164 (Ag-Cat) Series Aeroplanes\n\n| AD/G164/19 Amdt 1 | Fuel Shut-Off Control - Modification | 11/2007 |\n| ----------------- | ------------------------------------ | ------- |\n\n```html\n

Applicability:

As detailed in Table 1 and Table 2 of this AD.

Table 1

Model

Serial Numbers

(i) G-164A

1726A through 1730A

(ii) G-164B

335B through 659B

(iii) G-164C

1C through 44C

(iv) G-164D

1D through 22D

Table 2

Model

Serial Numbers

(i) G-164

All

(ii) G-164A

All except 1726A through 1730A

(iii) G-164B and G-164B with 73” wing gap

All except 335B through 659B

(iv) G-164B-15T

All

(v) G-164B-20T

All

(vi) G-164B-34T

All

(vii) G-164C

All except 1C through 44C

(iv) G-164D and G-164D with 73” wing gap

All except 1D through 22D

Requirement:

1. Modify the fuel shut-off valve control by installation of a new stop-plate, P/N A1552-71 (or FAA-approved equivalent) in accordance with Schweizer Aircraft Corp. Ag-Cat Service Bulletin No. 78, dated 26 January 1982.

2. Do not install any Gemini fuel shut-off valve P/N 3/4-86-6-RT-6 (A3580-1) on any aeroplane unless the stop-plate is installed per Requirement 1 of this AD.

Note: FAA AD 2007-12-02 Amdt 39-15160 dated 6 August 2007 refers. This AD supersedes FAA AD 82-07-04.

Compliance:

1. For Table 1 Aeroplanes - Remains unchanged as: Within the next 100 hours time-in-service (TIS) after 30 June 1982 (the effective date of the original issue of AD/G164/19), unless previously accomplished.

For Table 2 Aeroplanes - Within the next 100 hours TIS after the effective date of this AD.

2. As of the next 100 hours TIS after the effective date of this AD.

This Amendment becomes effective on 25 October 2007.

Background:

The issuing of this AD is to prevent turning the fuel shut-off valve clockwise past the \"ON'' position which, if not corrected, could allow the fuel valve to be rotated to an un-placarded \"OFF'' position.

This amendment adds to the applicability a list of models and serial numbers which were previously not included in the AD.

The original issue of this AD became effective 30 June 1982.

\n```\n\n![](image.001.png) \nCharles Lenarcic \nDelegate of the Civil Aviation Safety Authority\n\n29 August 2007","sortOrder":0},{"sectionNumber":"AD/G164/19 Amdt 1","sectionType":"part","heading":"AD/G164/19 Amdt 1","content":"## AD/G164/19 Amdt 1","sortOrder":1},{"sectionNumber":"Fuel Shut-Off Control - Modification","sectionType":"part","heading":"Fuel Shut-Off Control - Modification","content":"## Fuel Shut-Off Control - Modification","sortOrder":2},{"sectionNumber":"11/2007","sectionType":"part","heading":"11/2007","content":"## 11/2007","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Yes. The amendment expands applicability by adding models and serial numbers that were not included in the original AD, while retaining the original modification requirement (install stop-plate per Service Bulletin) and the stated compliance timeframes. The amendment became effective 25 October 2007 and supersedes the earlier FAA AD referenced in the document."},"complexity_factors":["Applicability split across two tables (Table 1 and Table 2) with model- and serial-number exceptions, increasing record-checking and applicability work for operators","Mandatory technical modification references an external service bulletin (Schweizer Ag‑Cat Service Bulletin No. 78) for the procedure","Express prohibition on installing a specific Gemini valve P/N unless the stop-plate is fitted creates a parts-installation constraint","Different compliance timing: Table 1 uses the original AD deadline (legacy aircraft) while Table 2 uses 100 hours TIS after this amendment","Cross-reference to FAA ADs and note that this AD supersedes an earlier FAA AD adds regulatory-history checks for compliance evidence","Costs and scheduling are borne by owners/operators (parts and labour), creating a compliance-burden for affected aircraft"],"plain_english_summary":"This AD requires fitting a stop-plate (P/N A1552-71 or FAA‑approved equivalent) to the fuel shut‑off valve control on specified Schweizer (Grumman) G‑164 (Ag‑Cat) series aircraft per Schweizer Service Bulletin No. 78, and prohibits installing a Gemini fuel shut‑off valve (P/N 3/4-86-6-RT-6 / A3580-1) unless that stop‑plate is fitted.\n\nIt applies to the models and serial numbers listed in the AD’s Table 1 and Table 2 and requires compliance within 100 hours time-in-service as stated. Owners/operators pay for parts and the modification; the regulator mandates and enforces compliance."},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":true,"description":"The original AD from 1982 (effective 30 June 1982) applied only to specific serial number ranges in Table 1. This 2007 amendment significantly expands scope by adding Table 2, which covers all other serial numbers of the G-164 series including turbine variants (B-15T, B-20T, B-34T) and aircraft with 73-inch wing gap modifications. The amendment transforms a limited recall into a fleet-wide mandate for the Ag-Cat series."},"complexity_factors":["Two-tier applicability structure (Table 1 vs Table 2) with different compliance dates and overlapping serial number ranges","Cross-reference to external technical document (Schweizer Service Bulletin No. 78) and FAA AD 2007-12-02 for implementation details","Specific part number requirements with 'FAA-approved equivalent' alternative creating conditional compliance pathway","Nested compliance timelines: original 1982 effective date, 2007 amendment effective date, and 100-hour time-in-service windows","Prohibition requirement (Requirement 2) with separate compliance timing from modification requirement","Serial number range exclusions in Table 2 ('All except...') creating negative applicability logic"],"plain_english_summary":"This mandatory CASA Airworthiness Directive requires owners/operators of Schweizer (Grumman) G‑164 “Ag‑Cat” aircraft to fit a stop‑plate on fuel shut‑off valve controls to prevent accidental rotation past ON into an unmarked OFF position that could cause fuel starvation. It also prohibits installing certain Gemini valves unless the stop‑plate is fitted. The AD updates and widens the original 1982 order, adds affected G‑164 variants, and sets short compliance windows."},"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"}},"importantCases":[],"_links":{"self":"/api/acts/ad-g164-19-amdt-1-fuel-shut-off-control-modification","history":"/api/acts/ad-g164-19-amdt-1-fuel-shut-off-control-modification/history","analysis":"/api/acts/ad-g164-19-amdt-1-fuel-shut-off-control-modification/analysis","conflicts":"/api/acts/ad-g164-19-amdt-1-fuel-shut-off-control-modification/conflicts","importantCases":"/api/acts/ad-g164-19-amdt-1-fuel-shut-off-control-modification/important-cases","documents":"/api/acts/ad-g164-19-amdt-1-fuel-shut-off-control-modification/documents"}}