Commonwealth legislation

AD/EMB-120/27 Amdt 3 - Icing Conditions

In ForceCTH

Jurisdiction

Commonwealth

Collection

legislative instrument

Plain English Summary

6/10 complexity

This Airworthiness Directive for Embraer EMB-120 aircraft requires flight crews to turn the deice boots on immediately when ice is detected, mandates installation and later modification of a low‑speed aural/visual alarm per SB 120‑30‑0033, and cancels prior AFM amendments in favour of AFM‑120/813 Revision 70. It affects aircraft operators, maintainers and flight crew: operators bear the cost and scheduling burden of installations, AFM changes and training, while crews gain a procedural requirement and limited discretion to inhibit or cancel the alarm.

JSON API

Deep dive

Want the full deep dive?

Zoe can write the in-depth analysis on top of the summary above: how it works, who it affects and what each part actually does.

Current sections

Direct links to the current provisions in AD/EMB-120/27 Amdt 3 - Icing Conditions.

Whenever ice is detected: immediately

turn deice boots on

5. Install a low speed aural/visual alarm system in the center glare shield in accordance with SB 120-30-0033 Rev 01 dated 6 September 2001, Rev 02 dated 14 September 2002 or Rev 03 dated 22 October 2001.

Note 1: This system should be installed after or together with removal of the leading edge boots inflation cycle control "light-heavy" switch, as per Requirement 3.

6. Superseded by Requirement 13.

7. Superseded by Requirement 13.

8. Superseded by Requirement 13.

9. Superseded by Requirement 13.

10. Superseded by Requirement 13.
11. Superseded by Requirement 13.

Embraer EMB-120 (Brasilia) Series Aeropl

Embraer EMB-120 (Brasilia) Series Aeroplanes

AD/EMB-120/27 Amdt 3 (Continued)

12. Modify the low speed aural/visual alarm system to permit inhibition of the alarm when landing gear is down and locked or cancellation of the aural alarm by flight crew in accordance with SB 120-30-0033 Rev 03.
13. Remove all Aircraft Flight Manual (AFM) revisions/amendments introduced by Amendment 1 or 2 of this Directive and ensure that AFM-120/813 has Revision 70 incorporated.

Note 2: Brazilian DAC AD 2001-05-02R2 Amdt 39-924 and AD 2001-0502R2 Errata refer.

Compliance: Requirement 1 - Not applicable.

Requirement 2 - Not applicable.

Requirement 3 - Remains unchanged, as ‘Within 400 hours TIS or 180 days from the effective date of the original issue of this Directive whichever is later’.

Requirement 4 - No later than 28 June 2002.

Requirement 5 - No later than 28 June 2002. Requirement 6 - Not applicable.

Requirement 7 - Not applicable. Requirement 8 - Not applicable. Requirement 9 - Not applicable. Requirement 10 - Not applicable. Requirement 11 - Not applicable.

Requirement 12 - No later than 28 June 2002.

Requirement 13 - Within seven days from the effective date of this Directive. This Amendment becomes effective on 23 May 2002.

Background: The Brazilian Departamento de Aviação Civil (DAC) received reports of loss of control events when flying in icing conditions, indicating that flight crew can misjudge both the severity of ice accretion and the need to take immediate action to prevent excessive loss of airspeed, especially when using the autopilot. The original issue of this Directive imposed operational limitations in the AFM, together with installation of placards in the cockpit, and removal of the deice boots “light- heavy” switch.

Source text

Sourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.

Whenever ice is detected: immediately Whenever ice is detected: immediately