Form F-900-12C

NOTICE OF PROPOSED REGULATION

BRAZILIAN AIRWORTHINESS DIRECTIVES

REPÚBLICA FEDERATIVA DO BRASIL

AGÊNCIA NACIONAL DE AVIAÇÃO CIVIL – ANAC

Gerência Geral de Certificação de Produto Aeronáutico

Reference: NPR/AD 2011-500-02 Date: 31 mar. 2011

In accordance with the provisions of RBAC 11, The Aeronautical Product Certification Branch (GGCP) is proposing 

the issuance of a Brazilian Airworthiness Directive applicable to the aeronautical product referred below.

All the persons interested may send their comments until the date specified in item 2, indicating the Reference above, 

to the following address or fax-number:

National Civil Aviation Agency (ANAC) - Aeronautical Product Certification Branch (GGCP)

Av. Cassiano Ricardo, 521, Bloco B, 2o andar, Parque Residencial Aquarius

12246-870 – São José dos Campos - SP - Brazil - Fax: 55 (12) 3797-2330 - E-mail: pac@anac.gov.br

1. Proposer: Engineering Branch of Aeronautical Product Certification Branch.

2. Comments: Must be received until 29 Apr. 2011.

APPLICABILITY:

This Airworthiness Directive (AD) applies to Embraer Empresa Brasileira de Aeronáutica 

S.A. model EMB-500 airplanes of serial numbers 50000005 thru 50000217, 50000219 thru 50000221 and, 

50000226, that are equipped with Angle of Attack (AOA) sensors part number (P/N) C-100117-2 and 

cover plates P/N 500-01702-401 and/or P/N 500-01702-402.

CANCELLATION / REVISION:

This AD cancels and supersedes the AD No. 2010-11-01 – Amd 39-1325, dated 

20 December 2010, and is being issued to extend the applicability and include additional actions for 

airplanes that previously have complied with AD No. 2010-11-01.

REASON:

It has been found that moisture may accumulate and freeze, under certain conditions, in the 

gap between the AOA vane base assembly and the stationary ring of the sensor’s body. If freezing occurs 

both AOA sensors may get stuck and the Stall Warning Protection System (SWPS) will be no longer 

effective without alerting. This may result in inadvertent aerodynamic stall and loss of controllability of the 

airplane.

Since this condition may occur in other airplanes of the same type and affects flight safety, 

a corrective action is required. Thus, sufficient reason exists to request compliance with this AD in the 

indicated time limit.

REQUIRED ACTION:

Replacement of both AOA sensors and respective cover plates and, installation of AOA 

sensor cover plates.

COMPLIANCE:

The compliance must be executed as indicated below, unless already accomplished before.

Restatement of requirements of AD 2010-11-01, with instructions revised.

(a) Within 12 month or 300 flight hours after 20 December 2010 (the effective date of AD 2010-11-01), 

whichever occurs first, replace the left hand (LH) and the right hand (RH) AOA sensors P/N C-100117-2 

by another ones bearing P/N C-100117-3 and; replace the LH cover plate P/N 500-01702-401 and the RH 

cover plate P/N 500-01702-402 by another ones bearing P/N 500-01702-403 and P/N 500-01702-404 

respectively, in compliance with instructions described in Part I and II of Embraer Service Bulletin (SB) 

500-27-0006 revision 2, dated 2 September 2010.
CONTINUATION OF NPR/AD No.: 2011-500-02 Page No.: 2/2

Form F-900-12C

New requirements of this AD

(b) Within 09 months or 200 flight hours after [insert the AD effective date], whichever occur first, 

inspect the interface between AOA cover plates sensors and AOA sensors, in accordance with Figure 3 of 

Embraer SB 500-27-0006 revision 2, dated 02 September 2010, Part II. 

(1) If the sealant is correctly applied, in accordance with figure 3, no corrective action is required.

(2) If the sealant is not correctly applied or is missing, apply the sealant in accordance with part II of 

Accomplishment Instructions of Embraer Service Bulletin 500-27-0006 revision 2, dated 02 

September 2010.

Alternative means of Compliance (AMOC)

(c) A different method or a different compliance time, with requirements of this AD, may be used if 

approved by the General Manager of the Aeronautical Product Certification Branch (Gerência-Geral de 

Certificação de Produtos Aeronáuticos (GGCP)).

Record compliance with this AD in the applicable maintenance log book.