BRAZILIAN AIRWORTHINESS
DIRECTIVE
SERVIÇO PÚBLICO FEDERAL
EFFECTIVE DATE:
DEPARTAMENTO DE AVIAÇÃO CIVIL
AD No.:
05 August 1991
90-07-01R1
The following Airworthiness Directive (AD), issued by the Departamento de Aviação Civil
(DAC) in accordance with provisions of Chapter IV, Title III of Código Brasileiro de Aeronáutica Law NR 7,565 dated 19 December 1986 - and Regulamento Brasileiro de Homologação Aeronáutica
(RBHA) 39, applies to all aircraft registered in the Registro Aeronáutico Brasileiro. No person may
operate an aircraft to which this AD applies, unless it has previously complied with the requirements
established herein.
AD No. 90-07-01R1 - EMBRAER - Amendment 39-677.
APPLICABILITY:
This AD is applicable to all EMB-110 and EMB-121 aircraft equipped
with main landing gear half upper locking drag strut P/N 14284, 14284A,
14284-001, 14284-002, 14334, 14334A, 14334-001 or 14334-002.
CANCELLATION/REVISION:
This AD cancels tbe prescriptions of AD 90-07-01 - Amdt 39-638 dated
July 09, 1990, considering the following reasons:
1. It has been found only one case of failure of a main landing gear
half upper locking drag strut.
2. The metalurgical analysis of the failure has showed that the same
was provoked by a static overload.
3. A fracture mechanics analysis considering an existing machined
recess, subject covered by SB ERAM NR 110-032-0506, and a crack of
0.5 mm length has showed that the strength of the locking drag
strut is so small that would not be the reason for a static
failure under the normal service loads.
So, there is not an operational unsafe condition to justify the
issuance of this AD. Therefore is endorsed the classification "recommended"
established by ERAM and EMBRAER to the ERAM SB 110-032-0506.
CONTACT:
For additional information, contact:
Centro Técnico Aeroespacial
Instituto de Fomento e Coordenação Industrial
Divisão de Homologação Aeronáutica
Caixa Postal 6001
Telex: 1233393 CTAE BR
Fax (55) (123) 41-4766
12225 São José dos Campos, SP - Brazil
Form FDH-900-04B
CONTINUATION OF AD No.:
90-07-01R1 -
AMENDMENT
39-677
PAGE No.:
2/2
EFFECTIVE DATE:
This AD (90-07-01R1, Mdt 39-677) becomes effective on AGO 05, 1991
Original in Portuguese signed by:
PAULO GASTÃO SILVA - Maj Eng
Chefe da Divisão de Homologação Aeronáutica
IFI/CTA
JOSÉ WALTER SOUZA TELLES - Ten Cel Av
Chefe da Divisão de Aeronaves e Manutenção - TE-1
STE/DAC
Note: The original issue of this AD (90-07-01, Amdt 39-638) was not published
in Engllish Language.
NOTE 2: Original AD signed and issued on 05 Aug 1991. This document was reedited in electronic
format on 06 Mar 2001 and its text is identical to the original one.
Form FDH-900-04B