eurocopter 

an EADS Company 

EUROCOPTER 

DIRECTION TECHNIQUE SUPPORT 

13725 MARIGNANE CEDEX FRANCE 

EMERGENCY 

T.F.S. No. 00000301 

ALERT SERVICE BULLETIN 

DAUPHIN ! NUMBER I VERSIONS 

365 65.44 Civil: C, C1, C2, C3 

365 62.00.22 1 Civil: N, N1, N2, N3 

: Military: F, Fs, Fi, K 

565 62.00.08 ; 

Military: AA, MA, MB, SA, SB, UB 

SUBJECT: MAIN ROTOR 

Check of the Main Rotor Hub-to-Mast Bolted Attachment 

ATA: 62 or 65 

REVISION No. 

Revision 0 

Approved under EASA DOA No. 21J.056 

DATE OF APPROVAL 

On: April10, 2006 

DATE OF ISSUE 

2006.04.10 

Page 1/10 

2006.04.10 
eurocopter 

an EADS Company 

T.F.S. No. 00000301 

2. ACCOMPLISHMENT INSTRUCTIONS 

2.A. GENERAL 

Not applicable. 

2.8. OPERATIONAL PROCEDURE 

2.B.1. Preliminary steps 

- Remove the MGB cowlings, as per MET Work Card 53.50.00.401 or 53.50.401. 

- Remove fairing (a). 

2.B.2. Check of the tightening torque of the main rotor hub/mast assembly attachment bolts 

As per Figure 1: 

- Remove the lockwire from bolt heads (b). 

- Measure the tightening torque of bolts (b), in accordance with the procedure described in MTC Work 

Card 20.02.05.404. 

- Put a mark on the head of any bolt (b) that has a tightening torque of less than 3.2 m.daN. 

Interpretation of the results: 

a) If the tightening torque of all the bolts (b) is equal to or more than 3.2 m.daN: 

NOTE1 

The 3. 2 m. daN tightening torque is indicative of a loss of 

approximately 30% of the recommended minimum tightening 

torque for these attachment bolts. 

- Carry out the following operation on each of the 16 bolts (b). one after the other: 

. Loosen one bolt (b) . 

. Retain nut (c) and washer (d) . 

. Lubricate the thread of nut (c) and re-install washer (d) and nut (c) . 

. Torque tighten bolt (b) to the tightening torque specified on the Figure shown in MET Work Card 

62.20.00.401 or 65.14.401. 

- Lock the bolts (b) with lockwire, as per MET Work Card 62.20.00.401 or 65.14.401. 

- Comply with paragraph 2.B.3. 

Approved under EASA DOA No. 21J.056 Page 6/10 

2006.04.10 
eurocopter 

an EADS Company 

T.F.S. No. 00000301 

b) If the tightening torque of at least one of the bolts (b) is less than 3.2 m.daN : 

1) Attachment on which the tightening torque of less than 4 adjacent bolts (b) is less than 3.2 

m.daN: 

- One after the other, replace the bolts (b) that have a tightening torque of less than 3.2 m .daN, 

as per MET Work Card 62.20.00.401 or 65.14.401. 

- Apply the procedure described in paragraph 2.B.2.a. to the remaining bolts (b). 

2) Attachment on which the tightening torque of more than 3 adjacent bolts (b) is less than 3.2 

m.daN: 

- Remove the main rotor, as per MET Work Card 62.20.00.401 or 65.14.401. 

- Check the condition of the components, as per MET Work Card 62.30.00.601 or 65.13.601. 

- Replace any bolts (b) that have a tightening torque of less than 3.2 m.daN. 

- Re-install the main rotor, as per MET Work Card 62.20.00.401 or 65.14.401. 

2.B.3. Final steps 

-Install fairing (a), as per MET Work Card 62.20.00.401 or 65.14.401. 

-Install the MGB cowlings, as per MET Work Card 53.50.00.401 or 53.50.401. 

- If the main rotor was removed, carry out the operations defined in MET Work 

Card 62.20.00.605 or 65.14.603. 

2.C. IDENTIFICATION 

Record compliance with this ALERT SERVICE BULLETIN in the aircraft documents. 

2.D. OPERATING AND MAINTENANCE INSTRUCTIONS 

Not applicable. 

Approved under EASA DOA No 21J 056 Page 7/10 

2006.04 10 
eurocopter 

an EADS Company 

b, 

Figure 1 

Approved under EASA DOA No 21J 056 

a 

T.F.S. No. 00000301 

Page 8i10 

2006 04 10