{"id":"F2008L02944","name":"AD/PREMIER/4 - Stall Warning System Angle-of-Attack Transmitters","slug":"ad-premier-4-stall-warning-system-angle-of-attack-transmitters","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":74900,"registerId":"commonwealth-F2008L02944-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Hawker Beechcraft (Raytheon) 390 Series ","sectionType":"division","heading":"Hawker Beechcraft (Raytheon) 390 Series Aeroplanes","content":"### Hawker Beechcraft (Raytheon) 390 Series Aeroplanes\n\n| AD/PREMIER/4 | Stall Warning SystemAngle-of-Attack Transmitters | 10/2008 DM |\n| ------------ | ------------------------------------------------ | ---------- |\n\n| Applicability: | Model 390 aeroplanes, serial numbers RB-4 through RB-204. |\n| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement: | 1. If not previously accomplished, incorporate Raytheon Aircraft Company (RAC) Temporary Change to the Approved Aircraft Flight Manual (AFM) part number (P/N) 390-590001-0003CTC7, issued: 15 March 2007, into the AFM. |\n| | 2. Carry out a post-flight check for residual heat in the both the left hand (LH) and right hand (RH) stall warning angle-of-attack (AOA) probes in accordance with the procedures in AFM Temporary Change P/N 390-590001-0003CTC7. |\n| | This check may be accomplished by the owner/operator who holds at least a private pilot licence who must make an appropriate entry in the aircraft Technical Records certifying completion of the check. |\n| | CAUTION: TO PREVENT POSSIBLE BURNS, USE EXTREME CAUTION TOUCHING HEATED AREAS. TO CHECK HEATING AND AVOID BURNS, HOLD HAND NEAR HEATED AREA OR MOVE HAND GRADUALLY FROM AMBIENT AREA TOWARD HEATED AREA UNTIL WARMTH CAN BE FELT. |\n| | 3. If, as a result of the Requirement 2 check, residual heat is not detected carry out a post-flight maintenance manual operational test of the heat of the AOA probes in accordance with the procedures in AFM Temporary Change P/N 390-590001-0003CTC7 and Hawker Beechcraft Mandatory Service Bulletin SB 27-3787, issued: May 2007. |\n| | 4. If the AOA probe fails the Requirement 3 operational test replace the probe in accordance with the procedures in SB 27-3787. |\n| | 5. Replace or modify (upload software) the stall warning AOA transmitters by accomplishing one of the following actions in accordance with the procedures in SB 27-3787: |\n| | a. Upload new software Kit No. 123-3436 (Field Software UploadSLZ8060-3,-4) to the AOA transmitters; or |\n| | b. Replace any P/N SLZ8060-3 and/or P/N SLZ8060-4 AOA transmitters with new P/N SLZ8060-5 AOA transmitters. |\n\n| | 6. Remove AFM Temporary P/N 390-590001-0003CTC7 from the AFM. |\n| ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| | 7. AOA transmitter P/N SLZ8060-3 or SLZ8060-4 that does not have the new upgraded software per Requirement 5.a. may not be installed as a replacement spare on any aeroplane. |\n| | Later revisions of SB 27-3787, approved by the United States Federal Aviation Administration (FAA) as an Alternate Method of Compliance (AMOC) to FAA AD 2008-16-02, are considered acceptable for compliance with the equivalent Requirements of this Directive. |\n| | Note: FAA AD 2008-16-02 Amdt 39-15620 refers. |\n| Compliance: | For Requirement 1 - Within 15 hours time-in-service (TIS) after 3 September 2008 (the effective date of this Directive) or within 30 days after 3 September 2008, whichever occurs first. |\n| | For Requirement 2 - Following every flight after AFM Temporary Change is inserted in accordance with Requirement 1 until Requirement 5.a. or 5.b. is accomplished. |\n| | For Requirements 3 and 4 - Before further flight. |\n| | For Requirement 5 - Within 250 hours TIS after 3 September 2008 or within 12 months after 3 September 2008, whichever occurs first. |\n| | For Requirement 6 - Following compliance with Requirement 5.a. or 5.b. |\n| | For Requirement 7 - As of 3 September 2008. |\n| | This Airworthiness Directive becomes effective on 3 September 2008. |\n| Background: | The FAA has received reports of the potential for unannunciated loss of the heating function in the LH and RH stall warning AOA transmitters of Model 390 aeroplanes. This Directive initially requires repetitive post-flight checks for residual heat in the AOA probes and, if necessary, maintenance manual operational test of the heat of the AOA probes. The Directive also requires eventual replacement or modification (upload software) of the stall warning AOA transmitters and is issued to correct potentially inadequate stall warning with loss of stick pusher function. |\n\n![](image.001.png) \nJames Coyne \nDelegate of the Civil Aviation Safety Authority\n\n1 August 2008","sortOrder":0},{"sectionNumber":"AD/PREMIER/4","sectionType":"part","heading":"AD/PREMIER/4","content":"## AD/PREMIER/4","sortOrder":1},{"sectionNumber":"Stall Warning SystemAngle-of-Attack Tran","sectionType":"part","heading":"Stall Warning SystemAngle-of-Attack Transmitters","content":"## Stall Warning System \nAngle-of-Attack Transmitters","sortOrder":2},{"sectionNumber":"10/2008 DM","sectionType":"part","heading":"10/2008 DM","content":"## 10/2008 DM","sortOrder":3}],"analysis":{"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"},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This is a standard Airworthiness Directive format consistent with original intent. The document follows the typical structure of Australian ADs (applicability, requirements, compliance, background) and addresses a specific airworthiness issue without expanding beyond aviation safety regulation."},"complexity_factors":["Multiple interdependent requirements (7 distinct requirements with specific sequencing)","Conditional logic: Requirements 3 and 4 only trigger if Requirement 2 check fails","Alternative compliance paths: Requirement 5 offers two different technical solutions (software upload OR hardware replacement)","Cross-references to external documents: References Raytheon AFM Temporary Change P/N 390-590001-0003CTC7, Hawker Beechcraft Mandatory Service Bulletin SB 27-3787, and FAA AD 2008-16-02","Multiple compliance timeframes: Different deadlines for each requirement (15 hours/30 days, every flight, before further flight, 250 hours/12 months, immediate)","Specific part numbers and serial number ranges create precise applicability boundaries","Delegated authority mechanism: CASA Delegate signature indicates exercise of statutory power under Civil Aviation Act 1988"],"plain_english_summary":"This AD requires owners/operators of specified Hawker Beechcraft (Raytheon) 390 series jets to address a latent failure of angle‑of‑attack transmitter heating that can silently disable stall warnings and the stick‑pusher in icing conditions. \n\nIt mandates immediate pilot procedures to check probe heating and a mandated permanent fix (software or hardware replacement) within the compliance window. It matters because undetected probe icing can lead to loss of stall protection and a high risk of loss of control."},"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":false,"description":"The Directive implements an initial repetitive inspection regime followed by mandatory transmitter upgrade or replacement to correct potential loss of AOA probe heating and inadequate stall warning; this mirrors the FAA safety action referenced (FAA AD 2008‑16‑02) and does not expand or narrow that stated corrective purpose within the instrument's text (Background; Requirements 1–5)."},"complexity_factors":["Multiple sequential obligations with different deadlines (Requirements 1–7; Compliance table): immediate AFM change, repetitive post‑flight checks, 'before further flight' tests if a check fails, and a 250 TIS/12‑month retrofit window for transmitters.","Mixture of operator‑level and maintenance‑level tasks: owner/operator with at least a private pilot licence may perform the post‑flight heat check and must make a Technical Records entry (Requirement 2), while operational tests, software uploads and part replacements reference maintenance documents and service bulletin SB 27‑3787 (Requirements 3–5).","Technical dependency on external guidance: procedures to be followed are those in RAC AFM Temporary Change P/N 390‑590001‑0003CTC7 and Hawker Beechcraft SB 27‑3787 (Requirements 1, 2, 3, 5), increasing compliance complexity for operators without ready access to those documents.","Choice of compliance path: operators may either upload new software (Kit No. 123‑3436) or replace transmitters with P/N SLZ8060‑5 (Requirement 5.a/b), creating inventory and procedural decisions.","Immediate parts restriction: AOA transmitters P/N SLZ8060‑3 or SLZ8060‑4 without the upgraded software may not be used as replacement spares as of the effective date (Requirement 7), affecting spare stock management.","Safety‑critical enforcement: failed post‑flight checks trigger maintenance tests and 'before further flight' corrective action (Requirements 3–4), raising operational disruption risk.","Acceptance of FAA‑approved alternate methods: later revisions of SB 27‑3787 approved by the FAA as AMOC are acceptable, introducing regulatory interdependence (AMOC/Note)."],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Hawker Beechcraft Model 390 aeroplanes (serial RB‑4 to RB‑204) to insert a temporary AFM change, perform a post‑flight residual‑heat check of both angle‑of‑attack (AOA) probes after every flight until corrective action, and to test, replace or upgrade the AOA transmitters (software upload or hardware replacement) within specified time limits. It is intended to restore AOA probe heating and preserve stall‑warning and stick‑pusher function; it shifts routine inspection and eventual upgrade costs and maintenance tasks onto operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-premier-4-stall-warning-system-angle-of-attack-transmitters","history":"/api/acts/ad-premier-4-stall-warning-system-angle-of-attack-transmitters/history","analysis":"/api/acts/ad-premier-4-stall-warning-system-angle-of-attack-transmitters/analysis","conflicts":"/api/acts/ad-premier-4-stall-warning-system-angle-of-attack-transmitters/conflicts","importantCases":"/api/acts/ad-premier-4-stall-warning-system-angle-of-attack-transmitters/important-cases","documents":"/api/acts/ad-premier-4-stall-warning-system-angle-of-attack-transmitters/documents"}}