{"id":"F2005L02379","name":"AD/PA-34/51 Amdt 1 - Combustion Heater Fuel Pumps","slug":"ad-pa-34-51-amdt-1-combustion-heater-fuel-pumps","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":36786,"registerId":"commonwealth-F2005L02379-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Piper PA-34 (Seneca) Series Aeroplanes","sectionType":"division","heading":"Piper PA-34 (Seneca) Series Aeroplanes","content":"### Piper PA-34 (Seneca) Series Aeroplanes\n\n| AD/PA-34/51 Amdt 1 | Combustion Heater Fuel Pumps | 10/2005 |\n| ------------------ | ---------------------------- | ------- |\n\n```html\n

Applicability:

Group 1: The New Piper Aircraft, Inc. aeroplanes retained from AD/PA34/51 original issue:

Model

Serial Nos.

PA-34-200T

34-7570002 through 34-8170092.

PA-34-220T

34-8133002 through 3449278.

Group 2: The New Piper Aircraft, Inc. aeroplanes (not included in AD/PA34/51 original issue) added to the applicability of this Directive:

Model

Serial Nos.

PA–34–220T

3449279 through 3449309.

Requirement:

1. Group 1 aeroplanes:

(a) Visually inspect any installed aircraft heater fuel pump (model 91E92-1 or model 91E93-1) for leakage in accordance with The New Piper Aircraft, Inc. Service Bulletin No. 1127, dated 26 February 2003, and Kelly Aerospace Power Systems Service Information Letter Bulletin No. A-110A, dated 6 March, 2003.

(b) If any leak is found, inspect the pump sealing surface for abnormalities (for example, nicks, gouges, or warping). Correct any abnormality found. If any abnormality cannot be corrected, replace the header fuel pump in accordance with The New Piper Aircraft, Inc. Service Bulletin No. 1127, and Kelly Aerospace Power Systems Service Information Letter Bulletin No. A-110A.

(c) Do not install any heater fuel pump (model 91E92–1 or model 91E93-1) unless you have visually inspected the pump for leakage and corrected any abnormalities specified in Requirement 1(b) of this Directive in accordance with The New Piper Aircraft, Inc. Service Bulletin No. 1127, and Kelly Aerospace Power Systems Service Information Letter Bulletin No. A-110A.

\n```\n\n| | 2. Group 2 aeroplanes:(a) Visually inspect any installed aircraft heater fuel pump (model 91E92-1 or model 91E93-1) for leakage in accordance with The New Piper Aircraft, Inc. Service Bulletin No. 1127B, dated 18 April 2005, and Kelly Aerospace Power Systems Service Information Letter Bulletin No. A-110B, dated 20 December 2004.(b) If any leak is found, inspect the pump sealing surface for abnormalities (for example, nicks, gouges, or warping). Correct any abnormality found. If any abnormality cannot be corrected, replace the heater fuel pump in accordance with The New Piper Aircraft, Inc. Service Bulletin No. 1127B, and Kelly Aerospace Power Systems Service Information Letter Bulletin No. A-110B.(c) Do not install any heater fuel pump (model 91E92-1 or model 91E93-1) unless you have visually inspected the pump for leakage and corrected any abnormalities specified in Requirement 2(b) of this Directive in accordance with The New Piper Aircraft, Inc. Service Bulletin No. 1127B, and Kelly Aerospace Power Systems Service Information Letter Bulletin No. A-110B.Note: FAA AD 2005-15-10 Amdt 39-14199 refers. |\n| ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Compliance: | 1. Group 1 aeroplanes:(a) Remains unchanged as Within the next 10 hours time in service (TIS) after 27 June 2003 (the effective date of the original issue of this Directive).(b) Prior to further flight.(c) From the effective date of this Directive.2. Group 2 aeroplanes:(a) Unless already accomplished, within the next 10 hours TIS, after the effective date of this Directive.(b) Before further flight after the inspection required in Requirement 2(a) of this Directive.(c) From the effective date of this Directive. |\n| | This Amendment becomes effective on 29 September 2005. |\n\n| Background: | The original issue of this Directive required a one- time inspection of the combustion heater fuel pumps for fuel leakage. If leakage was found, repair or replacement of the fuel pump was undertaken. This Directive retains all those actions and includes additional serial numbers for the Models PA-34-220T aeroplanes in the applicability section. This Directive results from further investigation that concluded that additional fuel pumps that did not meet the quality control (inspection or design) requirements of the Directive had been installed in Models PA-34-220T and aeroplanes. Quality control problems with the heater fuel pump could result in failure of the heater fuel pump. Such failure could lead to fire or explosion in the cockpit. |\n| ----------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png) \nJames Coyne \nDelegate of the Civil Aviation Safety Authority\n\n18 August 2005","sortOrder":0},{"sectionNumber":"AD/PA-34/51 Amdt 1","sectionType":"part","heading":"AD/PA-34/51 Amdt 1","content":"## AD/PA-34/51 Amdt 1","sortOrder":1},{"sectionNumber":"Combustion Heater Fuel Pumps","sectionType":"part","heading":"Combustion Heater Fuel Pumps","content":"## Combustion Heater Fuel Pumps","sortOrder":2},{"sectionNumber":"10/2005","sectionType":"part","heading":"10/2005","content":"## 10/2005","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This amendment broadens the Directive's scope by adding additional PA‑34‑220T serial numbers (Group 2: 3449279 through 3449309) to the applicability (see Applicability tables and Background). It retains the original one‑time inspection/repair requirements and the same timing requirements (10 hours TIS / before further flight) but extends who must comply. The amendment became effective 29 September 2005 (Effective date)."},"complexity_factors":["Two applicability groups with precise serial-number ranges (Group 1 and newly added Group 2) increase tracing and tracking burden (see Applicability table).","Mandated actions reference external manufacturer documents (Piper Service Bulletin No.1127/1127B and Kelly A-110A/A-110B), so compliance requires access to and reliance on those publications (Requirement 1(a)-(c); Requirement 2(a)-(c)).","Timing constraints are strict (within 10 hours TIS or before further flight), creating operational disruption and scheduling cost for operators (Compliance section).","Prohibition on installing pumps unless inspected and defects corrected shifts upfront compliance responsibility to maintenance providers and installers (Requirement 1(c) & 2(c)).","Inspection outcome rules: visual leak check, inspect sealing surface for nicks/gouges/warping, correctable defects may be repaired but uncorrectable defects require replacement — introduces judgment calls for maintainers about 'correctable' (Requirement 1(b), 2(b)).","Amendment preserves original one‑time inspection framework (not recurring checks) but expands the fleet; implementing this one‑time action still requires record‑keeping and parts availability which can impose supply costs (Background; Compliance)."],"plain_english_summary":"This amendment requires visual inspections of combustion-heater fuel pumps (models 91E92-1 and 91E93-1) on specified Piper PA‑34‑200T and PA‑34‑220T aeroplanes, and prohibits installing these pumps unless inspected and any sealing-surface defects are corrected or the pump replaced. \n\nOwners/operators and maintenance organisations must carry out inspections within short time limits (typically within 10 hours time-in-service or before further flight). The stated purpose is to detect leakage and prevent heater-pump failures that could lead to fire or explosion."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":true,"description":"This amendment expanded the scope beyond the original 2003 directive by adding Group 2 aircraft (additional serial numbers for PA-34-220T models). The original directive only covered specific serial number ranges, but further investigation revealed quality control problems affected additional aircraft not originally captured. The substantive safety requirements remain the same, but the population of affected aircraft has grown."},"complexity_factors":["Two distinct aircraft groups with different compliance documents (Service Bulletin 1127 vs 1127B)","Nested conditional requirements (inspection → if leak found → inspect surface → if cannot correct → replace)","Cross-references to four external technical documents (Piper Service Bulletins and Kelly Aerospace bulletins)","Multiple compliance deadlines depending on group membership and whether actions were already completed","Specific model and serial number applicability tables requiring careful matching"],"plain_english_summary":"CASA mandates inspection of cabin-heater fuel pumps on specified Piper PA‑34 (Seneca) aircraft for leaks; any leaking pump must be repaired or replaced before further flight. This 2005 amendment adds more PA‑34‑220T serials to the 2003 AD after quality-control defects were found — leaks can cause cockpit fire or explosion, so inspections are required within 10 flight hours."},"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-pa-34-51-amdt-1-combustion-heater-fuel-pumps","history":"/api/acts/ad-pa-34-51-amdt-1-combustion-heater-fuel-pumps/history","analysis":"/api/acts/ad-pa-34-51-amdt-1-combustion-heater-fuel-pumps/analysis","conflicts":"/api/acts/ad-pa-34-51-amdt-1-combustion-heater-fuel-pumps/conflicts","importantCases":"/api/acts/ad-pa-34-51-amdt-1-combustion-heater-fuel-pumps/important-cases","documents":"/api/acts/ad-pa-34-51-amdt-1-combustion-heater-fuel-pumps/documents"}}