{"id":"F2008L01402","name":"AD/B727/210 - Auxiliary Fuel Tank Systems","slug":"ad-b727-210-auxiliary-fuel-tank-systems","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":73660,"registerId":"commonwealth-F2008L01402-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Boeing 727 Series Aeroplanes","sectionType":"division","heading":"Boeing 727 Series Aeroplanes","content":"### Boeing 727 Series Aeroplanes\n\n| AD/B727/210 | Auxiliary Fuel Tank Systems | 6/2008 |\n| ----------- | --------------------------- | ------ |\n\n```html\n

Applicability:

Model 727 aeroplanes, equipped with an auxiliary fuel tank system installed in accordance with the following United States Federal Aviation Administration (FAA) Supplemental Type Certificates (STC):

Aircraft Model

STC Number

STC Holder

727-200

SA1350NM

DTAA, Inc
101 Deer Meadow Court
St Charles MO 63304

727-100

ST0158AT

Southeast Aero-Tec, Inc
675 Oleander Drive
Merritt Island FL 32952

727-200 & -200F

SA2033NM & SA1474SO

Southeast Aero-Tec, Inc
675 Oleander Drive
Merritt Island FL 32952

Requirement:

Deactivate the auxiliary fuel tank system, as follows:

a. For aeroplanes modified in accordance with STC SA1350NM - In accordance with a deactivation procedure approved by the Manager, FAA Wichita Aircraft Certification Office (ACO).

b. For aeroplanes modified in accordance with STC ST0158AT, SA2033NM and SA1474SO - In accordance with a deactivation procedure approved by the Manager, FAA Atlanta ACO.

Any auxiliary fuel tank system component that remains on the aeroplane must be secured and must have no effect on the continued operational safety and airworthiness of the aeroplane. Deactivation may not result in the need for additional Instructions for Continued Airworthiness (ICA).

Note 1: Technical information regarding the auxiliary fuel tanks is available from:

a. For aeroplanes modified in accordance with STC SA1350NM - Steve Forness, DTAA, Inc, 101 Deer Meadow Court, St. Charles, MO 63304; telephone (636) 928-9606; fax (314) 749-7513.

\n```\n\n| | b. For aeroplanes modified in accordance with STC ST0158AT, SA2033NM and SA1474SO - Randy Smith, President, Southeast Aero-Tec, Inc, 675 Oleander Drive Merritt Island FL 32952; telephone(321) 453-7876;fax (321) 453-7872. |\n| ----------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| | Note 2: FAA AD 2008-07-07 Amdt 39-15448 and FAA AD2008-07-09 Amdt39-15450 refer. |\n| Compliance: | No later than 12 December 2008. |\n| | This Airworthiness Directive becomes effective on 5 June 2008. |\n| Background: | This Directive results from fuel tank system reviews conducted by the manufacturer. The Directive is issued to prevent the potential of ignition sources inside fuel tanks, which, in combination with flammable fuel vapours, could result in fuel tank explosions and consequent loss of the aeroplane. |\n\n![](image.001.png) \nJames Coyne \nDelegate of the Civil Aviation Safety Authority\n\n21 April 2008","sortOrder":0},{"sectionNumber":"AD/B727/210","sectionType":"part","heading":"AD/B727/210","content":"## AD/B727/210","sortOrder":1},{"sectionNumber":"Auxiliary Fuel Tank Systems","sectionType":"part","heading":"Auxiliary Fuel Tank Systems","content":"## Auxiliary Fuel Tank Systems","sortOrder":2},{"sectionNumber":"6/2008","sectionType":"part","heading":"6/2008","content":"## 6/2008","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":5,"scope_assessment":{"changed":false,"description":"The directive targets a defined subset of Boeing 727 aeroplanes modified under listed STCs and requires deactivation of those auxiliary fuel-tank systems. This aligns with the stated original safety intent (removing potential ignition sources in fuel tanks) and does not broaden scope beyond the specified STC-fitted aircraft."},"complexity_factors":["Applies only to 727 models fitted with multiple, specific FAA STCs (SA1350NM, ST0158AT, SA2033NM, SA1474SO) — requires identifying affected aircraft.","Deactivation must follow procedures approved by external FAA ACO managers (Wichita or Atlanta) — introduces inter-jurisdictional approval dependency.","Technical work to deactivate and secure any remaining components without affecting continued operational safety/airworthiness.","Explicit constraint that deactivation may not trigger additional Instructions for Continued Airworthiness (ICA) — limits remedial pathways.","Fixed compliance deadline (12 Dec 2008) — creates schedule pressure for operators.","References corresponding FAA ADs (2008-07-07 and 2008-07-09) — requires cross-referencing and coordination with FAA guidance."],"plain_english_summary":"Requires owners/operators of certain Boeing 727 aeroplanes fitted with specified FAA Supplemental Type Certificates (auxiliary fuel tanks) to deactivate those auxiliary fuel tank systems using deactivation procedures approved by the relevant FAA Aircraft Certification Office manager (Wichita or Atlanta). Any remaining tank components must be secured and must not affect airworthiness. The stated purpose is to remove potential ignition sources inside fuel tanks to prevent fuel-tank explosions. Compliance was required by 12 December 2008."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific airworthiness risk in a limited fleet of modified aircraft. The scope remains tightly focused on the original safety purpose — preventing fuel tank explosions in Boeing 727s with specific auxiliary tank modifications."},"complexity_factors":["Multiple specific STC (Supplemental Type Certificate) numbers must be cross-referenced to determine applicability","Different compliance procedures required depending on which STC was used (Wichita ACO vs Atlanta ACO)","Technical aviation terminology throughout (STC, ACO, ICA, airworthiness)","External references to FAA ADs (2008-07-07 and 2008-07-09) that are not fully reproduced","Specific contact details and technical information sources listed","Hard deadline compliance date (12 December 2008)"],"plain_english_summary":"This CASA Airworthiness Directive mandates that certain Boeing 727-100/200 aircraft fitted with auxiliary fuel tank systems under specific US STCs be permanently disabled by 12 December 2008, using FAA-approved procedures. Any remaining components must be secured without creating extra maintenance requirements. The AD responds to a risk of ignition inside auxiliary tanks that could cause fuel-tank explosions and loss of the aircraft. It affects operators of 727s modified under the listed STCs and the companies that certified those mods."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b727-210-auxiliary-fuel-tank-systems","history":"/api/acts/ad-b727-210-auxiliary-fuel-tank-systems/history","analysis":"/api/acts/ad-b727-210-auxiliary-fuel-tank-systems/analysis","conflicts":"/api/acts/ad-b727-210-auxiliary-fuel-tank-systems/conflicts","importantCases":"/api/acts/ad-b727-210-auxiliary-fuel-tank-systems/important-cases","documents":"/api/acts/ad-b727-210-auxiliary-fuel-tank-systems/documents"}}