{"id":"F2007L00697","name":"AD/LEARJET 35/40 - Standby Fuel Pump Annunciators","slug":"ad-learjet-35-40-standby-fuel-pump-annunciators","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":64270,"registerId":"commonwealth-F2007L00697-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Gates Learjet 35 and 36 Series Aeroplane","sectionType":"division","heading":"Gates Learjet 35 and 36 Series Aeroplanes","content":"### Gates Learjet 35 and 36 Series Aeroplanes\n\n| AD/LEARJET 35/40 | Standby Fuel Pump Annunciators | 4/2007 |\n| ---------------- | ------------------------------ | ------ |\n\n```html\n

Applicability:

Learjet model 35, 35A, 36 and 36A aeroplanes identified in Bombardier Service Bulletin (SB) 35/36-28-11 Revision 4 dated 4 December 2000.

Requirement:

1. Modify the left- and right-hand standby fuel pump switches, in accordance with the Accomplishment Instructions of SB 35/36-28-11 Revision 4.

Later revisions of the above SB, approved by the United States Federal Aviation Administration (FAA) as an Alternate Method of Compliance (AMOC) to FAA AD 2007-04-18, is/are considered acceptable for compliance with the equivalent Requirements of this Directive.

2. Revise the Emergency and Abnormal Procedures sections of the applicable Learjet Aircraft Flight Manual (AFM) to advise the flight crew of proper procedures to follow in the event of failure of the standby fuel pump to shut off by including the information in the applicable Learjet Temporary Flight Manual (TFM) changes identified below:

TFM Change

TFM 96-08

TFM 96-09

Date

30 May 1996

30 May 1996

AFM

35/36 (FM-019)
35A/36A FC-200 (FM-102)
35A/36A FC-530 (FM-108)

35/36 (FM-019)
35A/36A FC-200 (FM-102)
35A/36A FC-530 (FM-108)

This may be accomplished by inserting a copy of the TFM changes into the AFM.

When the TFM changes have been included in the general revisions of the AFM, those general revisions may be inserted into the AFM, provided the relevant information in the general revisions is identical to that in the TFM changes.

Note: FAA AD 2007-04-18 Amdt 39-14950 refers.

Compliance:

For Requirement 1 - Within 24 months after the effective date of this Directive.

\n```\n\n| | For Requirement 2 - Before further flight after accomplishing the Requirement 1 modification. |\n| ----------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| | This Airworthiness Directive becomes effective on 12 April 2007. |\n| Background: | This Directive results from a report to the FAA of inadvertent operation of a standby fuel pump due to an electrical system malfunction. The Directive requires the modification of the left and right hand standby fuel pump switches together with the revision of the Emergency and Abnormal Procedures sections of the AFM to advise the flight crew of the proper procedures to follow in the event of failure of the standby fuel pump to shut off. |\n| | The Directive is issued to prevent this inadvertent operation, which could result in inadvertent fuel transfer by the left or right wing fuel system and subsequent over-limit fuel imbalance between the left and right wing fuel loads. This imbalance could affect lateral control of the aeroplane which could result in reduced controllability. |\n\n![](image.001.png) \nDavid Punshon \nDelegate of the Civil Aviation Safety Authority\n\n23 February 2007","sortOrder":0},{"sectionNumber":"AD/LEARJET 35/40","sectionType":"part","heading":"AD/LEARJET 35/40","content":"## AD/LEARJET 35/40","sortOrder":1},{"sectionNumber":"Standby Fuel Pump Annunciators","sectionType":"part","heading":"Standby Fuel Pump Annunciators","content":"## Standby Fuel Pump Annunciators","sortOrder":2},{"sectionNumber":"4/2007","sectionType":"part","heading":"4/2007","content":"## 4/2007","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The Directive maintains its original safety-focused scope: mandate the standby fuel pump switch modification and AFM procedure update for the affected Learjet models to prevent inadvertent pump operation and possible fuel imbalance, as described in the instrument's Background."},"complexity_factors":["Technical modification required to aircraft electrical/switching system per Bombardier SB 35/36-28-11 Rev 4 (requires certified maintenance capability).","Dual compliance obligations: a physical modification (hardware) and a procedural/document change (AFM/TMF insertion).","Clear applicability limited to aircraft identified in the referenced service bulletin (operator must check SB applicability).","Staged compliance timing: modification within 24 months, AFM change required before next flight after the modification.","Regulatory cross-reference: later SB revisions may be acceptable if FAA approves them as an Alternate Method of Compliance (AMOC).","Operational risk trade-off: addresses a low-frequency electrical malfunction with potential high-consequence aerodynamic effects, requiring coordination between maintenance and flight crew procedures."],"plain_english_summary":"**What it changes:** Requires operators of certain Learjet 35/35A/36/36A aeroplanes to modify the left and right standby fuel pump switches according to Bombardier Service Bulletin 35/36-28-11 Revision 4 and to update the Aircraft Flight Manual (Emergency and Abnormal Procedures) using specified Temporary Flight Manual changes. \n\n**Who it affects and why it matters:** Applies to aeroplanes listed in that service bulletin. The civil regulator says the changes prevent inadvertent standby-pump operation that could transfer fuel and create a wing-fuel imbalance. Operators pay for the modification and must comply within set time limits."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard, targeted airworthiness directive addressing a specific safety-of-flight issue (fuel pump electrical malfunction). The scope remains tightly focused on the original safety concern without expansion into unrelated operational areas."},"complexity_factors":["Single, specific technical requirement with clear mechanical and documentation components","Cross-reference to external technical document (Bombardier Service Bulletin 35/36-28-11 Revision 4)","Conditional acceptance of later revisions if approved by FAA as Alternate Method of Compliance (AMOC)","Two distinct compliance deadlines with different timing requirements (24 months vs before further flight)","Specific reference to multiple Temporary Flight Manual (TFM) document numbers and Aircraft Flight Manual (AFM) variants","Nested condition for AFM updates: allows general revisions to substitute for TFM inserts only if content is identical"],"plain_english_summary":"This AD requires owners/operators of certain Learjet 35/35A/36/36A aircraft to modify left and right standby fuel pump switches (per Bombardier SB 35/36-28-11 Rev 4 or later) within 24 months and to update the flight manual with emergency procedures before the aircraft next flies after the hardware change. It prevents an electrical fault that can cause fuel to transfer between wing tanks, creating a dangerous imbalance and loss of control."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/ad-learjet-35-40-standby-fuel-pump-annunciators","history":"/api/acts/ad-learjet-35-40-standby-fuel-pump-annunciators/history","analysis":"/api/acts/ad-learjet-35-40-standby-fuel-pump-annunciators/analysis","conflicts":"/api/acts/ad-learjet-35-40-standby-fuel-pump-annunciators/conflicts","importantCases":"/api/acts/ad-learjet-35-40-standby-fuel-pump-annunciators/important-cases","documents":"/api/acts/ad-learjet-35-40-standby-fuel-pump-annunciators/documents"}}