9 

ANAC 

JEPARTMENT OF 

.i^HSPORWlON 

• :^KEi OPERATIONS 

nn OCT 'U P !• 38 

Sao Jos6 dos Campos, 22 September 2010 

Agericia Nacional de Aviagao Civil 

Of. 1296/2010/GGCP/SAR-ANAC 

U.S. Department Transportation 

Docket Management System 

400 7* Street, SW, Room PL 401 

Washington, DC 20591-0001 

USA 

Subject: EMB-135BJ - FAA Validation 

Embraer's Petition to amend the exemption granted by FAA exemption n° 7933. 

Ref.: 1. Embraer Letter GCF-0818/2010-1/5, dated July 26,2010. 

2. FAA exemption n° 7933 

Enclosure: Embraer Letter GCF-1002/2010-1/5, dated August 20, 2010. 

Dear Sir, 

1. ANAC has been requested to send to the FAA the enclosed document related to the 

Embraer's petition to amend the exemption granted by the referred FAA document, from the requirement 

of 14 CFR Part 25.901(c), for the EMB-135BJ (Legacy Enhanced) equipped with the AE3007A2 engines. 

2. The Embraer letter attached cancels the letter referred above. 

3. Mrs. Rafaela Patti Caillaux is the project officer assigned for this program. For additional 

information on this subject, she may be contacted directly by telephone at 55 (12) 3797-2615, by fax at 55 

(12) 3797-2330 or by email rafaela.caillaux@.anac.gov.br. 

Yours sincerely, 

Helio Tarquinio Jiufiior 

General Manager - Acting Manager 

Aeronautical Product Certification Branch 

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RPC/kam 

Copies: 

LSE 

PHT 

EMB 

EMB 

PROTOCOLO ANAC 

1 rafaela.cailIauxr«:anac.gov.b>- 00800.134657/2010-34 

1 rodrigo.fernandesrtjcmbracr.com.br 

1 certif;('/'}eml)raer.coin.br 

SuperintendSncia de Aeronavegabilidade - SAR 

GerSncia-Geral de CertificaQao de Produto Aeron4utico - GGCP 

Avenida Cassiano Ricardo, 521 - Ed. Aquarius Center - Bloco B - 2- andar - Parque Residencial Aquarius 

12246-870 - sac Jos6 dos Campos - SP - Brasil - Tel: 55 (12) 3797-2525 - Fax: 55 (12) 3797-2330 

www.anac.gov.br/certificacao 
September 21, 2010. v; e|v/|BBAECI 

GCF-1002/2010 - 1/5 ^ civiDi-i>AEi-i 

GNS/jcmr 

U.S. Department Transportation 

Docket Management System 

400 7th Street, SW, Room PL 401 

Washington, DC 20591-0001. 

USA 

Subject: EMB-135BJ - FAA Validation 

Embraer Petition to amend the exemption granted by document (FAA 

Exemption no. 7933), from the requirement of 14CFR §25.901 (c), for the 

EMB-135BJ (Legacy Enhanced) equipped with the AE3007A2 engines. 

Gentlemen: 

This letter cancels the letter GCF-0818/2010. 

Please find enclosed Embraer's petition to amend the exemption granted by document 

(FAA Exemption no. 7933), from the requirement of 14CFR §25.901 (c), for the EMB135BJ (Legacy Enhanced) equipped with the AE3007A2 engines. 

Best Regards, 

^^i^^a^a/6cuci 

Ricardo LavaU HoUerbtu^ 

Certification Office I 

'Sergio Augusto Viana de Can/alho I 

Airworthiness Manager i 

C.c: FAA- Mr. Sanjay Ralhan - Program Manager- EMB-135BJ 

ANAC - Mrs. Rafaela P. Caillaux - Program Manager - EMB-135BJ 
GCF-1002/2010-2/5 ^ EMBRAER 

i 

Petition to amend the exemption granted by document (FAA Exemption no. 7933) 

Summary 

Petitioner: EMBRAER Empresa Brasileira de Aeronautica S/A 

Sections of the Regulation Affected: 14CFR §25.901 (c) Amendments 25-1 through 25-

84, and additional requirements as per IP G-1 originated from the significant major 

modification presented in the DCA 0145-000-00020-2008 "EMB-135BJ Performance 

Enhancements". 

Description of Relief Sought: Exemption of EMBRAER EMB 135 BJ Aircraft from the no 

single failure requirements of 14CFR §25.901 (c) as it relates to uncontrollable high 

thrust failure conditions. 
GCF-1002/2010-3/5 ^ EMBRAER 

Embraer respectfully submits the enclosed Petition for an exemption for the EMB-135BJ 

model with the modifications presented in the DCA 0145-000-00020-2008/FAA, herein 

called EMB-135BJ Enhanced, from the no single failure requirements of 14CFR 

§25.901 (c) as it relates to uncontrollable high thrust failure conditions. 

Embraer proposes to amend the FAA Exemption no. 7933 granted to EMB-135BJ 

equipped with engine AE3007A1E from requirement 14CFR §25.901 (c) for the EMB135BJ Enhanced equipped with the AE3007A2 engine. 

TEXT OF REQUIREMENT FOR WHICH EXEMPTION IS SOUGHT 

14 CFR §25.901 (c) "Installation" 

(c) For each powerplant and auxiliary power unit installation, it must be established that 

no single failure or malfunction or probable combination of failures will jeopardize the 

safe operation of the airplane except that the failure of structural elements need not be 

considered if the probability of such failure is extremely remote. 

GROUNDS SUPPORTING EXEMPTION 

The EMB-145XR and EMB-135BJ, previous models of the Legacy Enhanced, have 

received partial exemption of compliance with the requirement since there were three 

scenarios, all of them on ground, not successfully demonstrated to be entirely in 

accordance with the requirement. FAA have granted exemption to these models 

through Exemptions No. 7908 (October 21, 2001, for EMB-145XR) and No. 7933 

(December 12, 2001 for EMB-135BJ). 

The EMB-135BJ Enhanced is equipped with Rolls-Royce AE3007A2 engines, a 

modification over the previous engine model, the AE3007A1E. This engine modification 

consists of a new fan module with fewer fan blades (22 instead of 24 on A1E) and new 

spinner among other components of fan module. Please see the figure below with the 

main differences from A1E and A2 engines. A1E parts are represented in green and A2 

ones in blue. 
GCF-1002/2010-4/5 ^ EMBFIAER 

All the rest of the engine is maintained the same as the A1E engine, including 

compressor, combustion chamber, turbines, exhaust, FPMU (Fuel Pump and Metering 

Unit) & FADEC hardware. FADEC software is being updated to receive A2 thrust tables 

among other modifications/improvements. 

The AE3007A2 engine Max TO (Take Off) thrust (9022 Ibf) has increased about 14%, 

comparing to the AE3007A1E (7974 Ibf) engine currently used on EMB-135BJ, but the 

maximum peak thrust during a MMV (Main Metering Valve) position failure (fully open) 

in the AE3007A2 is 10,501 Ibf, against the 10,150 Ibf. 

Aircraft handling qualities analysis for the Uncontrollable High Thrust (UHT) scenarios 

(MMV fully open), for the EMB-135BJ with AE3007A2 engines showed that with the 

additional thrust increase (3.5%), the results are similar to the ones obtained with 

AE3007A1E engines. Small differences were found between the required flight control 

surfaces deflections for the EMB-135BJ (Legacy 600) and EMB-135BJ Enhanced 

(Legacy 650) (less than 1 degree) and the deflections are far from any detent. 

Therefore, all UHT analysis results from the EMB-135BJ with AE3007A1E engines are 

applicable to the EMB-135BJ with AE3007A2 engines. 
GCF-1002/2010-5/5 - ^ EMBRAER 

The UHT protection logic and corrections implemented in the EMB-145 family FADEC 

since first certification have shown positive results with almost 13 million flight hours 

accumulated with no safety issues since the last UHT event in 2003. AE3007A2 FADEC 

is inheriting all EMB-145 family FADEC improvements and corrections implemented 

during its history. 

During a meeting held during May 2010 at FAA facilities in Seattle with FAA, Embraer 

and Rolls Royce it was discussed that the existing exemption should be amended and 

stay valid for a period of four years after FAA validation. During this period, Embraer 

and Rolls-Royce will develop and make available improved UHT logic which will 

shutdown engines on the ground only upon detecting high N1 and with a TLA command 

at or less than idle. This improved UHT logic is the only known practical action (cost 

beneficial and technologically feasible) to address the scenarios exempted by the 

memo, in order to minimize the adverse effects on safety associated with granting 

exemption from 14CFR §25.901 (c) for the EMB-135BJ Equipped with AE 3007A2 

engines. 

No later than four years from the granting of Amendment A to this Exemption (i.e. 

Exemption # 7933A), for all airplanes EMB-135BJ to which this exemption applies, 

Embraer must: 

(a) obtain FAA approval of amended type designs incorporating thrust 

malfunction detection and accommodation logic that protects against all noncompliant 

uncontrollable high thrust failures on ground, except for those due to failures within the 

airplane throttle system; 

(b) assure all new EMB-135BJ model production airplanes are equipped with the 

amended type designs of item (a) or subsequently approved thrust malfunction 

accommodation logic; and 

(c) obtain FAA approval of service instruction to facilitate retrofit of all existing EMB135BJ model airplanes with the amended type designs of item (a) and/or any 

subsequently approved thrust malfunction accommodation logic. 

Based on the above considerations Embraer respectfully proposes to amend the 

exemption granted by document (FAA Exemption no. 7933), from the requirement of 

14CFR §25.901(0), for the EMB-135 BJ (Legacy Enhanced) equipped with the 

AE3007A2 engines.