Via GiovanniAgusta, 520 

~ 

~___) IC.T... 21017 Cascina Costa di Sarna rate (VA) Italy 

""" Tel. : +39 0331-229111- Fax: +39 0331-229605/222595 

------ ------------------A N AGUSTAWESTLAND COMPANY 

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TRANSLATION OF 

N" 109-123 BOLLETTINO TECNICO 

The technical content of this document is approved 

under the authority of DOA nr EASA.21 J.005. 

DATE November 16, 2006 

Compliance with 

this Bollettino is: MANDATORY 

REV. 

SUBJECT: INSPECTION TO GROOVED CLAMPS P/N 4606AC THAT ATTACH 

THE ENGINE EXHAUST DUCTS. 

REASON: Perform an inspection to the subject grooved clamps for cracks and/or 

corrosion. 

HELICOPTERS AFFECTED: 

All Agusta A 1 09A, A 1 09AII and A 1 09C helicopters. 

COMPLIANCE: 

Within the next 50 (fifty) operating hours and however within and not later 

than March 31 , 2007. Successively every 300 (three hundred) 

hours/annually. 

DESCRIPTION: 

A case of the grooved clamp P/N 4606AC fixing the external left side 

engine exhaust duct fracture and the consequent loss of the exhaust has 

been reported on an A 1 09A helicopter. 

The failure caused an emergency landing without any consequences for 

the occupants. 

The investigation performed on the grooved clamp has revealed that the 

static fracture, due to an excessive load, has occurred in correspondence 

with the rivets in presence of evident corrosion. 

This Bollettino is issued in order to perform a visual inspection of the 

grooved clamps P/N 4606AC for cracks by means of a magnifying glass, 

and for presence of corrosion. 

REQUIRED MANPOWER: 

For the accomplishment of this Bollettino an estimated 4 (four) manpower 

hours are required. 

An appropriate entry should be mode 1n the oorcroft log book upon accomplishment. 

If ownership of aircraft has changed, please, forward to new owner. 

Page 1 of 4 
B.T. 109-123 

WARRANTY: 

N.A. 

REQUIRED MATERIALS: 

The following consumable material is required for compliance with this 

Bollettino: 

SPECIFICATION 

TT-N-95 Type 2 

DENOMINATION 

Aliphatic naphtha 

(cod. 531 055030) 

Q.TY 

A.R. 

SPECIAL TOOLS: 

N.A. 

WEIGHT AND BALANCE CHANGES: 

N.A. 

REFERENCES: 

Pertinent Maintenance Manual. 

PUBLICATIONS AFFECTED: 

Pertinent Maintenance Manual. 

COMPLIANCE INSTRUCTIONS: 

Page 2 of4 

(See figure 1) 

1 . Prepare the helicopter on ground for a safe maintenance, 

disconnect any power supply. 

2. In accordance with the instructions provided in the pertinent 

Maintenance Manual remove the engine cowlings . 

NOTE 

This inspection must be accomplished on 

all four grooved clamps P/N 4606AC 

fixing the engine exhaust duct. 

3. In accordance with the instructions provided in the pertinent 

Maintenance Manual remove the grooved clamp from the engine 

exhaust duct. Clean the grooved clamp with aliphatic naphtha or 

equivalent. 

NOTE 

Before the grooved clamp removal , 

perform a reference mark between 

clamp, exhaust tube and engine, in order 

to reinstall it in the same position. 
B.T. 109-123 

4. Perform the grooved clamp visual inspection as follows (see 

figure 1 ): 

4. 1. Inspect the inboard and outboard joint areas of the two half 

clamps in correspondence of the rivets, for presence of cracks by 

means of a 10 X magnifying glass. 

4.2. Inspect the clamp for presence of corrosion, especially in the 

inboard and outboard joint areas of the two half clamps in 

correspondence of the rivets. 

CAUTION 

In case presence of cracks and/or, 

corrosion are found, discard and replace 

the affected grooved clamp. 

5. In accordance with the instructions provided in the pertinent 

Maintenance Manual reinstall the grooved clamp. 

6. In accordance with the instructions provided in the pertinent 

Maintenance Manual reinstall the engine cowlings. 

7. Return the helicopter in ready to flight condition. 

8. Record compliance with this Bollettino in the helicopter log book. 

Page 3 of4 
B.T. 109-123 

Inboard joint area in 

which the inspection 

is performed. 

Typ. 4 places. 

Page 4 of4 

Outboard joint area in 

which the inspection is 

performed. 

Typ. 4 places. 

FIGURE 1