{"id":"F2007L01833","name":"AD/CESSNA 208/21 Amdt 1 - Low Airspeed Awareness System","slug":"ad-cessna-208-21-amdt-1-low-airspeed-awareness-system","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":66621,"registerId":"commonwealth-F2007L01833-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Cessna 208 Series Aeroplanes","sectionType":"division","heading":"Cessna 208 Series Aeroplanes","content":"### Cessna 208 Series Aeroplanes\n\n| AD/CESSNA 208/21 Amdt 1 | Low Airspeed Awareness System | 8/2007 DM |\n| ----------------------- | ----------------------------- | --------- |\n\n```html\n

Applicability:

Model 208 and 208B aeroplanes, equipped with the optional Cessna ‘flight into known icing equipment package’.

Requirement:

1. Incorporate the following new S1 ‘Known Icing Equipment’ Aircraft Flight Manual (AFM) supplement into the applicable AFM/Pilot’s Operating Handbook (POH):

AFM/POH Supplement

Affected Aeroplane

Model 208 (675 SHP) FAA-approved Flight Manual Supplement S1 “Known Icing Equipment,” Cessna document D1352-S1-10, dated 20 February 2007, or later FAA-approved revision that incorporates the same information.

Model 208 aeroplanes with a Pratt & Whitney of Canada Ltd (PWC),
PT6A-114A turboprop engine installed (675 SHP) or FAA-approved engine of equivalent or higher horsepower installed, equipped with airframe de-icing pneumatic boots, which are not currently prohibited from flight in known or forecast icing.

Model 208 (600 SHP) FAA-approved Flight Manual Supplement S1 “Known Icing Equipment,” Cessna document D1307-S1-09, dated 20 February 2007, or later FAA-approved revision that incorporates the same information.

Model 208 aeroplanes with a PWC PT6A-114 turboprop engine installed (600 SHP) or FAA-approved engine of equivalent horsepower installed, equipped with airframe de-icing pneumatic boots, which are not currently prohibited from flight in known or forecast icing.

Model 208B (675 SHP) FAA-approved Flight Manual Supplement S1 “Known Icing Equipment,” Cessna document D1329-S1-10, dated 20 February 2007, or later FAA-approved revision that incorporates the same information.

Model 208B aeroplanes with a PWC PT6A-114A turboprop engine installed (675 SHP) or FAA-approved engine of equivalent or higher horsepower installed, equipped with airframe de-icing pneumatic boots, which are not currently prohibited from flight in known or forecast icing.

\n```\n\n```html\n

Model 208B (600 SHP) FAA-approved Flight Manual Supplement S1 “Known Icing Equipment,” Cessna document D1309-S1-10, dated 20 February 2007, or later FAA-approved revision that incorporates the same information.

Model 208B aeroplanes with a PWC PT6A-114 turboprop engine installed (600 SHP) or FAA-approved engine of equivalent horsepower installed, equipped with airframe de-icing pneumatic boots, which are not currently prohibited from flight in known or forecast icing.

Note 1: The above supplements require the installation of a low speed awareness (LSA) system. Cessna Service Bulletin CAB06-11 and Cessna Caravan Service Kit SK208-171, both dated 9 October 2006 provide instructions for such an installation.

2. Remove the placards installed on the aeroplane in accordance with AD/CESSNA 208/20 Amdt 1 Requirement 2.c.

3. Remove any temporary revisions and amendments from the AFM/POH incorporated in accordance with AD/CESSNA 208/20 Amdt 1.

Note 2: The aeroplane Owner/Operator holding at least a Private Pilot Licence may carry out the AFM/POH changes detailed in Requirement 1and 3 provided that they make an entry in the aircraft records showing compliance with AD/CESSNA 208/21 Requirement 1 and 3.

Note 3: FAA AD 2007-10-15 Amdt 39-15056 refers.

Compliance:

For Requirement 1 - Within 90 days after the effective date of this Directive.

For Requirements 2 and 3 - Immediately after compliance with Requirement 1.

This Amendment becomes effective on 5 July 2007.

Background:

Currently AD/CESSNA 208/20 Amdt 1 requires the incorporation of information into the applicable section of the AFM/POH together with the installation of placards. This Directive was based on United States Federal Aviation Administration (FAA) AD 2006-06-06 as corrected on 5 April 2006. Since AD 2006-06-06 was issued Cessna has issued new S1 AFM supplements addressing ‘Known Icing Equipment’ and developed a low airspeed awareness system.

Consequently, the original issue of this Directive required the incorporation of the applicable AFM supplement revision together with the temporary retention of the requirements of AD/CESSNA 208/20 Amdt 1 until the new AFM supplement revisions are incorporated. The Directive also required the installation of a low airspeed awareness system. (One of the revised AFM supplement requirements being the installation of a functional low airspeed awareness system to operate the aeroplane in known icing conditions.)

\n```\n\n| | The original issue of this Directive was issued to assure that the pilot has enough information and the necessary equipment to prevent loss of control of the aeroplane while flying in icing conditions. This Amendment continues that action. |\n| --- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| | This Amendment is issued to clarify the applicability of the original issue following advice from the FAA. The Amendment limits the applicability to aeroplanes equipped with the optional Cessna flight into known icing equipment package and removes the requirement to install a LSA system, noting that the LSA system must be installed when the AFM Supplement S1 is incorporated in the AFM/POH. |\n| | AD/CESSNA 208/20 Amdt 1 will be cancelled once the compliance period of this Directive has passed. |\n| | The original issue of this Directive became effective on 5 July 2007. |\n\n![](image.001.png) \nDavid Punshon \nDelegate of the Civil Aviation Safety Authority\n\n19 June 2007","sortOrder":0},{"sectionNumber":"AD/CESSNA 208/21 Amdt 1","sectionType":"part","heading":"AD/CESSNA 208/21 Amdt 1","content":"## AD/CESSNA 208/21 Amdt 1","sortOrder":1},{"sectionNumber":"Low Airspeed Awareness System","sectionType":"part","heading":"Low Airspeed Awareness System","content":"## Low Airspeed Awareness System","sortOrder":2},{"sectionNumber":"8/2007 DM","sectionType":"part","heading":"8/2007 DM","content":"## 8/2007 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"},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"The amendment narrows and clarifies scope: it limits applicability to aircraft equipped with the optional Cessna flight‑into‑known‑icing equipment package and removes the prior immediate requirement to install the LSA system, instead making LSA installation a requirement tied to incorporation of the S1 AFM supplement. It also phases out the prior AD (AD/CESSNA 208/20 Amdt 1) once compliance is met (Background; Requirements 1–3)."},"complexity_factors":["Narrow, equipment‑based applicability that depends on model, engine variant and presence of the optional ‘flight into known icing’ package (Applicability).","Primary action is administrative (incorporate AFM/POH supplements) but ties to a hardware installation (LSA) specified by the supplements (Requirement 1; Note 1).","Dependency on external, FAA‑approved documents and Cessna service instructions (specific Cessna supplement documents, Service Bulletin CAB06‑11 and Service Kit SK208‑171) increases implementation friction (Requirement 1; Note 1).","Short compliance deadline for the AFM change (within 90 days) creates a time pressure for owners/operators (Compliance).","Cross‑reference to an earlier Directive and requirement to remove placards/temporary revisions creates sequencing obligations and will trigger cancellation of the prior AD after compliance (Requirements 2–3; Background).","Owner/operator with at least a Private Pilot Licence may perform the AFM/POH changes but must record compliance — lowers labour cost but requires accurate recordkeeping (Note 2).","Technical installation of the LSA is required by the supplement; although immediate installation is not mandated by this amendment, the installation becomes a precondition to operate in known icing conditions once the supplement is in the AFM (Requirement 1; Background)."],"plain_english_summary":"This amendment requires owners/operators of Cessna 208 and 208B aeroplanes fitted with the optional Cessna “flight into known icing” equipment package to incorporate an FAA‑approved S1 “Known Icing Equipment” supplement into the AFM/POH, and to remove prior placards and temporary AFM revisions. The supplements require a low‑speed awareness (LSA) system to be installed when the S1 is incorporated; the amendment clarifies the LSA is not mandatory before incorporation. The directive says its purpose is to ensure pilots have the information and equipment to prevent loss of control in icing conditions."},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This is an amendment to an existing Airworthiness Directive. The amendment narrows and clarifies the original scope rather than expanding it. It limits applicability to aircraft with the optional 'flight into known icing equipment package' and clarifies that the Low Speed Awareness system installation is part of the flight manual supplement incorporation rather than a separate requirement. The original purpose — ensuring safe operation in icing conditions through updated manuals and warning systems — remains intact."},"complexity_factors":["Multiple aircraft variants with different engine configurations (600 SHP vs 675 SHP) requiring different specific document references","Cross-references to previous directive AD/CESSNA 208/20 Amdt 1 for placard removal and background context","Conditional applicability based on optional equipment packages and existing flight prohibitions","Specific FAA document references with revision dates (D1352-S1-10, D1307-S1-09, D1329-S1-10, D1309-S1-10) that must be matched to specific aircraft configurations","Nested compliance structure: Requirement 1 has 90-day deadline, Requirements 2-3 contingent on completion of Requirement 1","Reference to external technical documents (Cessna Service Bulletin CAB06-11, Service Kit SK208-171) for installation instructions","Delegation of certain compliance actions to aircraft owners/operators holding Private Pilot Licences, subject to record-keeping requirements"],"plain_english_summary":"This CASA Airworthiness Directive mandates owners/operators of Cessna 208/208B aircraft equipped for flight into known icing to insert a new AFM/POH supplement with updated icing procedures, install a Low Speed Awareness (LSA) stall-warning system, and remove old placards and temporary manual revisions from the prior AD. \n\nIt affects aircraft with pneumatic de-ice boots and specific Pratt & Whitney engines, requires the AFM update within 90 days, and aims to reduce stall/loss-of-control risk in icing."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-208-21-amdt-1-low-airspeed-awareness-system","history":"/api/acts/ad-cessna-208-21-amdt-1-low-airspeed-awareness-system/history","analysis":"/api/acts/ad-cessna-208-21-amdt-1-low-airspeed-awareness-system/analysis","conflicts":"/api/acts/ad-cessna-208-21-amdt-1-low-airspeed-awareness-system/conflicts","importantCases":"/api/acts/ad-cessna-208-21-amdt-1-low-airspeed-awareness-system/important-cases","documents":"/api/acts/ad-cessna-208-21-amdt-1-low-airspeed-awareness-system/documents"}}