BRAZILIAN AIRWORTHINESS
DIRECTIVE
MINISTÉRIO DA AERONÁUTICA
EFFECTIVE DATE:
DEPARTAMENTO DE AVIAÇÃO CIVIL
AD Nr.:
16 March 98
97-10-08R1
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 Nr. 97-10-08R1 – ALLISON – Amendment 39-832.
APPLICABILITY:
This Airworthiness Directive is applicable to all Allison engine models
AE 3007A installed in the Embraer EMB-145 aircraft.
CANCELLATION / REVISION:
This AD supersedes EAD Nr. 97-10-08 – Amdt 39-814, dated 23 Oct.1997, and is
being issued to impose the accomplishment of a functional test of the compressor variable
geometry vanes system and the determination of the useful life of the respective torque tube.
REASON:
It has been found the possibility of occurrence of too much friction in the
compressor variable-vane torque tube system, which can cause a stress crack to develop in the
actuator arm of the titanium torque tube, which results in the partial fail, with loss of engine
thrust and eventually engine flame-out.
Since this condition may occur in other engines of the same type and affect flight
safety of the aircraft on which they are installed, an immediate corrective action is required.
Thus, sufficient reason exists to request compliance with this AD in the indicated time limit.
REQUIRED ACTION:
Testing of the variable-vane torque tube system and determination of the useful
life of the respective torque tube.
COMPLIANCE:
Required as indicated below, unless already accomplished, in function of the
compliance time established in the Allison Service Bulletin referred below.
Within the next 100 flight operating hours after the effective date of this
amendment, test the variable-vane torque tube system to determine the force required for
operation of the system and, as a result of that, the limit life of the torque tube at which it shall
be replaced.
Compliance with the original version of this AD does not eliminate the need to
further comply with this revision 1.
The detailed instructions and procedures to accomplish this AD are described in
the Allison Service Bulletin Nr. AE 3007A-A-75-005, or further revisions approved by the FAA
and endorsed by the CTA.
Form FDH-900-04A
CONTINUATION OF AD NR.:
97-10-08R1 -
AMENDMENT
39-832
PAGE NR.:
2/2
Record compliance with this AD in the applicable maintenance log book.
CONTACT:
For additional technical information or acquisition, contact:
Centro Técnico Aeroespacial - CTA
Instituto de Fomento e Coordenação Industrial - IFI
Divisão de Homologação Aeronáutica - FDH
Praça Mal. Eduardo Gomes, 50 - Vila das Acácias
Caixa Postal 6001
Fax: 55 (12) 341-4766
12231-970 - São José dos Campos - SP, BRAZIL.
APPROVAL:
LUIZ ALBERTO C. MUNARETTO - Ten.-Cel.-Av.
Chefe da Divisão de Homologação Aeronáutica
IFI/CTA
SILOMAR CAVALCANTE GODINHO - Cel.-Av.
Diretor do Instituto de Fomento e Coordenação Industrial
CTA
Note: Original in portuguese signed and will be available in the files of the Registro Geral
de Aeronavegabilidade (RGA/TE-1/STE) of the Departamento de Aviação Civil.
Form FDH-900-04A