# ALERT
Page 1 of 8



### BOLLETTINO TECNICO

The technical content of this document is approved under the authority of DOA nr. EASA.21J.005. N° 

# 412-133

DATE May 17, 2012

REV.

Compliance with this bulletin is:

SUBJECT: HOIST HOOK ASSEMBLY P/N BL-5740-8, INSPECTION OF.

REASON: To avoid loss of hoist hook assembly P/N BL-5740- 8 installed on hoist P/N BL20200-75 (Breeze Eastern) and/or hoist P/N BL-20200 -95 (Breeze Eastern).

HELICOPTERS AFFECTED: Agusta AB412 and AB412EP helicopters.

COMPLIANCE: Before next flight after receipt of this Bollettino , and subsequently every time the hook assembly is disassembled/reassembled.

DESCRIPTION: It is reported to Agusta a case of separation of Ho ok P/N HK-118-2. The investigation performed revealed that the nut P/N BL-10892 and ho using hook P/N BL-9197 were not properly screwed (ref. Figure 1). In this condition the two locking screws were not inserted into the slot located on the housing. Due to the si milarity between the locking systems used on Hook P/N HK-118-2 and Hook P/N BL-5740-8, installed on hoist P/N BL-20200-75 and/or hoist P/N BL-20200-95, this Bollettino provide the instructions to verify that the nut and body are properly screwed.B.T. 412-133

Page 2 of 8 MANPOWER REQUIRED: Approximately 0,5 man-hour is required to carry out the visual inspection.
WARRANTY: N.A. MATERIAL REQUIRED:

P/N DENOMINATION Q.TY MS-24665-88 (*) Cotter pin 2 Note: (*) Required only if it is necessary disassem bly/reassembly the hook assembly

SPECIAL TOOLS: N.A. WEIGHT AND BALANCE CHANGE: N.A. REFERENCES: AB412-IPC Illustrated Parts Catalogue AB412EP-IPC Illustrated Parts Catalogue AB412-MM Maintenance Manual TD-96-012 Breeze Eastern Operation and Maintenance Manual PUBBLICATIONS AFFECTED: AB412-MPM Maintenance Planning Manual
ACCOMPLISHMENT INSTRUCTIONS:
1. Prepare helicopter for safe ground maintenance.
2. Reel out cable from hoist as required to allow the maintenance of the hook.
3. Disconnect battery and all the electric power sourc e and/or the external power supply.
4. Pull down the rubber bumper (10) to get the visual of the set screw in the slot as illustrated in Figure 2.

a. If two screws (15) are inserted in the slots (ref. Figure 2), this indicates that nut and body are properly screwed. Check that rubber bumper (10) return in proper position. No other action is required, proceed in accordance with step 19.
b. If two screws (15) are not inserted in the slots ( ref. Figure 3), this indicates that nut and the body are not screwed. In this case proceed in a ccordance with following steps 5÷18.
5. With reference Figure 4 separate the bumper assembl y from the hook assembly. Pull bumper assembly from top of sleeve (13) then slide it up w ire rope cable toward the hoist assembly.
6. Remove cotter pins (16) and locking screws (15) fro m nut (14).B.T. 412-133

Page 3 of 8 7. While holding body (3), unthread nut (14), remove b ottom half of hook assembly and rubber bumper (10). Slide nut (14) and sleeve (13) up wire rope cable away from the ball end to expose terminal clamp (11).
8. Remove ring (18) from terminal clamp (11) and then remove terminal clamp (11), sleeve (13) and nut (14).
9. With reference Figure 4 and 5 reinstall nut (14), s leeve (13) with terminal clamp (11), onto ball end of hoist cable, and secure terminal clamp with ring (18).
10. Slide sleeve (13) and nut (14) down until terminal clamp (11) seats in sleeve (13). In accordance with Figure 5 verify that terminal clamp (11) and ring (18) are correctly seats in sleeve (13).
11. Install rubber bumper onto body (3). Thread body (3 ) with bottom half of hook assembly onto nut (14), until bottomed.
12. Back off nut (14) to line holes with next nearest s lots in body (3). Insert locking screws (15) and screw home to bottom of slot in body (3), and t hen secure locking screw in place with new cotter pins (16) P/N MS-24665-88.
13. Slide bumper assembly down and seats in sleeve (13)

. 14. Restore the power to the hoist, and proceed in acco rdance with following steps.
15. Run hoist to slowly pay out cable until the hook ca n be connected to a weight of 272 Kg.
16. Connect load to hook and slowly reel cable in until the weight is lifted off the ground
17. Once weight is off the ground, lower weight back to the ground and remove the weight.
18. Pull down the rubber bumper (10) to get visual of t he set screw in the slot as illustrated in Figure 2.

a. If two screws (15) are inserted in the slots (ref. Figure 2), this indicates that nut and body are properly screwed. Check that rubber bumper (10) return in proper position. No other action is required, proceed in accordance with step 20.
b. If two screws (15) are not inserted in the slots (r ef. Figure 3), this indicates that nut and the body are not screwed, in this case disconnect t he power to the hoist, and repeat steps
5÷18.
19. Reconnect battery and all the electric power source and/or the external power supply.
20. Run hoist to the full in position to secure to hook and bumper assembly on hoist.
21. Return the helicopter to flight status and annotate records to indicate compliance with this
Bollettino.B.T. 412-133

Page 4 of 8 Figure 1 – HK-118-2 Hook assembly (For reference on ly) NUT P/N BL-10892

HOUSING HOOK P/N BL-9197B.T. 412-133

Page 5 of 8 Figure 2 – Detail of Hook assembly P/N BL-5740-8 This condition indicated that nut and body are scre wed. The locking screws P/N BL-9920 are properly inserte d in the slot.

SCREW INSERTED IN THE SLOT NUT (14)

BODY (3)

RUBBER BUMPER (10)B.T. 412-133

Page 6 of 8 Figure 3 – Detail of hook assembly P/N BL-5740-8 (C otter pin omitted)

This condition indicated that nut and body are not screwed Locking screws P/N BL-9920 not inserted in the slot

.

SCREW NOT INSERTED IN THE SLOT NUT (14)

BODY (3)B.T. 412-133

Page 7 of 8 NOTE: Bumper assembly not illustrated

Figure 4 – BL-5740-8 Hook assembly WIRE ROPE ASSEMBLY

SWIVEL HOOK (1) SPACER (17) BODY (3) WASHER (4) BEARING (5) WASHER (19) RUBBER BUMPER (10) SCREW (15) COTTER PIN (16) TERMINAL CLAMP (11)

RETAINING RING (18)

LABEL (12) NUT (14)

PIN-SPRING (9)

NUT (8)

PACKING (6)

RETAINER BEARING (7)

SLEEVE (13)

BEARING (2)B.T. 412-133

Page 8 of 8 Figure 5 – Detail of terminal clamp installation HOIST CABLE

SLEEVE (13)

RING (18) TERMINAL CLAMP (11)Note: Remarks:

Informazioni: Information: Al fine di gestire le varianti alla configur azione base, in relazione all’emissione de l Bollettino Tecnico, preghiamo di voler compilare il presente modulo in tutte le sue parti e sped irlo all’indirizzo sopra indicato. Si ring razia per la gentile collaborazione data. We request your cooperation in filling this form, in order to keep out statistical data relevant to aircraft configuration up- to-date. The form should be filled in all its parts and sent to the above address. We thank you beforehand for the information given. **MODULO APPLICAZIONE BOLLETTINO TECNICO** TECHNICAL BULLETIN COMPLIANCE FORM Data: Date:

Numero: Number:

Revisione: Revision: Prego spedire a questo indirizzo: Please send to the following address: 

### AGUSTA **WESTLAND S.p.A.**  CUSTOMER SUPPORT & SERVICES - ITALY PRODUCT SUPPORT ENGINEERING DPT. Via del Gregge, 100 2101 5 Lonate Pozzolo (VA) - I T ALY T el

. : +39 0331 664905 Fa x : +39 0331 66468 4
Telefono: Telephone:

Fax:

Data Applicazione B.T.: B.T. Compliance Date: Denominazione Cliente ed Indirizzo: Customer Name and Address:

Modello Elicottero

Helicopter Model S/N Matricola Tail Number Ore Totali Total Hours Ore D.U.R. T.S.O.