{"id":"F2007L03635","name":"AD/PHZL/89 - Propeller Mounting Flanges","slug":"ad-phzl-89-propeller-mounting-flanges","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":70026,"registerId":"commonwealth-F2007L03635-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Propellers - Variable Pitch - Hartzell","sectionType":"division","heading":"Propellers - Variable Pitch - Hartzell","content":"### Propellers - Variable Pitch - Hartzell\n\n| AD/PHZL/89 | Propeller Mounting Flanges | 11/2007 TX |\n| ---------- | -------------------------- | ---------- |\n\n```html\n

Applicability:

Hartzell Propeller Inc. model HC-B5MP-3( )/M10282A( )+6 and
HC-B5MP-3( )/M10876( )( )( )( ) five-bladed propellers. These propellers are installed on the following aircraft:

Aeroplane Manufacturer

Model

Propeller/Blade

Supplemental Type Certificate

Nord

262(A) Frakes (Mohawk)

HC-B5MP-3(A)/M10282A(B)+6

SA2369SW

Short Brothers

SD3-30 (Sherpa)

HC-B5MP-3A/M10282AB+6

--

Short Brothers

SD3-60

HC-B5MP-3C/M10876ASK

--

Short Brothers

SD3-60-200 (Sherpa)

HC-B5MP-3C/M10876ANSK

--

PZL Mielec

PZL-M18( ) (Dromader)

HC-B5MP-3C/M10876(A)( )

SA1014GL

The parentheses appearing in the propeller model number indicates the presence or absence of an additional letter(s) that varies the basic propeller model. This AD still applies regardless of whether these letters are present or absent in the propeller model designation.

Requirement:

1. If either the propeller mounting flange or the engine mounting flange has not been resurfaced using either Hartzell Propeller Inc. Alert Service Bulletin (SB) No. A203A, dated 5 January 1995, or SB No. HC-SB-61-275, dated 2 June 2005, perform a torque inspection of the propeller mounting bolts.

Use paragraphs 3.A. through 3.A.(4) of the Accomplishment Instructions of Hartzell Propeller Inc. SB No. HC-SB-61-275, to do the inspections.

2. If the torque of any one bolt is found to be less than 90 ft-lbs, as detailed in Requirement 1 of this AD then remove and inspect the propeller, and resurface the flanges as necessary.

Use paragraphs 3.B. through 3.B.(5) of the Accomplishment Instructions of Hartzell Propeller Inc. SB No. HC-SB-61-275, to do the inspection and resurfacing. Replace all mounting bolts with new mounting bolts.

\n```\n\n| | 3. If the propeller and engine mounting flanges have been resurfaced using either Hartzell Propeller Inc. Alert SB No. A203A, or SB No. HC-SB-61-275, and a fretting disk was not installed, then:a. Perform a torque inspection of the propeller mounting bolts.Use paragraphs 3.A. through 3.A.(4) of the Accomplishment Instructions of Hartzell Propeller Inc. SB No. HC-SB-61-275, to do the inspections.b. If the torque of any one bolt is found to be less than 90 ft-lbs, remove and inspect the propeller, and resurface the flanges as necessary.Use paragraphs 3.B. through 3.B.(5) of the Accomplishment Instructions of Hartzell Propeller Inc. SB No. HC-SB-61-275, to do the inspection and resurfacing. Replace all mounting bolts with new mounting bolts.4. If the propeller and engine mounting flanges have been resurfaced, using either Hartzell Propeller Inc. Alert SB No. A203A, or SB No. HC-SB-61-275, and a fretting disk was installed, then:a. Remove the propeller, and inspect the propeller and engine mounting flanges. Resurface the flanges if necessary and replace the fretting disk.b. Thereafter, remove the propeller and repeat the flange inspections and replace the fretting disk.Use paragraphs 3.B. through 3.B.(5) of the Accomplishment Instructions of Hartzell Propeller Inc. SB No. HC-SB-61-275, to do the inspection and resurfacing. Replace all mounting bolts with new mounting bolts.5. Inspect the propeller and engine mounting flanges and resurface the flanges if necessary.Use paragraphs 3.B. through 3.B.(5) of the Accomplishment Instructions of Hartzell Propeller Inc. SB No. HC-SB-61-275, to do the inspection and resurfacing. Replace all mounting bolts with new mounting bolts.Note: FAA AD 2006-22-12 Amdt 39-14809 refers. This AD supersedes FAA AD 2004-21-01 which is referred to in AD/SD3-30/23 Amdt 2. In addition AD/SD3-60/41 refers to Hartzell SB A203A. |\n| ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Compliance: | 1. For propellers having 3,000 or more flight hours (FH) time-since-new (TSN) on the effective date of this AD:- Before further flight after the effective date of this AD, if the bolt torque inspection has never been done, and thereafter at intervals not to exceed 120 FH. |\n\n| | - For bolts last inspected using AD/SD3-30/23 or AD/SD3-60/41: Within 120 FH from the last inspection or from the effective date of this AD, whichever occurs first, unless already done, and thereafter at intervals not to exceed 120 FH.For propellers having fewer than 3,000 FH TSN on the effective date of this AD - upon reaching 3,000 FH TSN, and thereafter at intervals not to exceed 120 FH.2. Before further flight after the effective date of this AD.3. a. Within 120 FH after reaching 1,500 FH from the time the flanges were last resurfaced, and thereafter at intervals not to exceed 120 FH.b. Before further flight after the effective date of this AD.4. a. Within 120 FH after reaching 1,500 FH from the time the flanges were last resurfaced.b. At intervals not to exceed 1,500 FH.5. Whenever the propeller is removed from the engine and whenever a propeller is removed from an engine to be installed on an aeroplane model not listed in this AD. |\n| ----------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| | This Airworthiness Directive becomes effective on 17 September 2007. |\n| Background: | This AD results from reports of fretting wear still occurring between the engine and propeller mounting flanges. The fretting wear results in loss of mounting bolt preload, causing failure of the mounting bolts. The actions specified in this AD are intended to prevent propeller separation from the aeroplane.AD/SD3-30/23 Amdt 2 and AD/SD3-60/41 have been cancelled following the issue of this AD. |\n\n![](image.001.png) \nCharles Lenarcic \nDelegate of the Civil Aviation Safety Authority\n\n10 September 2007","sortOrder":0},{"sectionNumber":"AD/PHZL/89","sectionType":"part","heading":"AD/PHZL/89","content":"## AD/PHZL/89","sortOrder":1},{"sectionNumber":"Propeller Mounting Flanges","sectionType":"part","heading":"Propeller Mounting Flanges","content":"## Propeller Mounting Flanges","sortOrder":2},{"sectionNumber":"11/2007 TX","sectionType":"part","heading":"11/2007 TX","content":"## 11/2007 TX","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":7,"scope_assessment":{"changed":true,"description":"This AD modifies prior coverage by superseding and cancelling earlier ADs and by clarifying and expanding required actions. It prescribes specific inspection methods and resurfacing steps tied to paragraphs of Hartzell SB No. HC‑SB‑61‑275, mandates replacement of all mounting bolts, and sets distinct compliance intervals based on flight hours and whether a fretting disk was installed (see Requirements 1–5; Compliance; Background). These additions change the operational detail and enforcement scope compared with earlier directives referenced in the text."},"complexity_factors":["Multiple conditional branches: actions differ if flanges have not been resurfaced, have been resurfaced without a fretting disk, or have been resurfaced with a fretting disk (Requirements 1–4).","Cross‑references to manufacturer procedures: inspections and resurfacing must follow specific paragraphs (3.A.–3.A.(4) and 3.B.–3.B.(5)) of Hartzell Propeller Inc. SB No. HC‑SB‑61‑275 (Requirement 1 and subsequent steps).","Variable compliance timing linked to flight hours and service history: thresholds include 3,000 FH TSN, 1,500 FH since resurfacing, and recurring 120 FH or 1,500 FH intervals depending on condition (Compliance section).","Mandatory hardware replacement combined with inspection work: all mounting bolts must be replaced when resurfacing/inspecting (Requirements 2–5).","Model‑specific applicability: a detailed table lists specific Hartzell propeller models and the aeroplane types to which the AD applies (Applicability table).","Interaction with prior directives: this AD supersedes or cancels earlier ADs and refers to FAA AD 2006‑22‑12 and earlier FAA AD 2004‑21‑01, creating dependencies for compliance history (Background; Note).","Technical nature of required work (torque inspections, resurfacing, fretting disk replacement) requires approved maintenance providers and judgement about whether resurfacing is necessary (Requirements 1–4)."],"plain_english_summary":"This Airworthiness Directive requires operators of specified Hartzell five‑bladed variable‑pitch propellers (installed on listed aircraft) to perform torque inspections of propeller mounting bolts, resurface propeller and engine mounting flanges per Hartzell service bulletins when needed, and replace mounting bolts. It sets different checks and intervals depending on whether flanges were resurfaced and whether a fretting disk was fitted.\n\nCompliance intervals are tied to flight‑hour thresholds and prior inspections; operators pay for inspections, resurfacing and bolt replacement to address fretting wear that can reduce bolt preload and risk propeller separation."},"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"},"kimi_summary":{"content_quality":"ok","complexity_score":6,"scope_assessment":{"changed":false,"description":"This AD appears to maintain its original scope as a targeted safety directive for specific Hartzell propeller models. While it consolidates and replaces two previous ADs (AD/SD3-30/23 and AD/SD3-60/41), this represents streamlining rather than scope expansion. The directive remains focused on the specific technical issue of mounting flange fretting and bolt integrity for the identified propeller models."},"complexity_factors":["Multiple conditional pathways (5 different requirement scenarios based on maintenance history and flange resurfacing status)","Cross-references to external technical documents (Hartzell Service Bulletins A203A and HC-SB-61-275) without reproducing their full content","Nested compliance timelines varying by flight hours (FH), time-since-new (TSN), and previous inspection history","Technical aviation terminology requiring specialized knowledge (fretting, preload, TSN, flange resurfacing)","Model number variations indicated by placeholder parentheses requiring careful interpretation","Cancellation of two previous ADs with partial incorporation of their requirements into new structure"],"plain_english_summary":"This CASA Airworthiness Directive requires inspections and corrective maintenance on certain Hartzell five‑bladed HC‑B5MP‑3 series propellers installed on Nord 262, Short SD3‑30/SD3‑60 and PZL M‑18/Dromader aircraft. It mandates checking for fretting‑induced bolt loosening, resurfacing flanges if bolts are loose, and replacing all mounting bolts, on schedules tied to flight hours and prior maintenance.\n\nIt affects owners/operators and maintenance engineers and aims to prevent catastrophic in‑flight propeller separation."}},"importantCases":[],"_links":{"self":"/api/acts/ad-phzl-89-propeller-mounting-flanges","history":"/api/acts/ad-phzl-89-propeller-mounting-flanges/history","analysis":"/api/acts/ad-phzl-89-propeller-mounting-flanges/analysis","conflicts":"/api/acts/ad-phzl-89-propeller-mounting-flanges/conflicts","importantCases":"/api/acts/ad-phzl-89-propeller-mounting-flanges/important-cases","documents":"/api/acts/ad-phzl-89-propeller-mounting-flanges/documents"}}