# ALERT

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### BOLLETTINO TECNICO

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

# 412

- 132

DATE May 02

, 20 1 2

REV.

Compliance with

this bulletin is:

SUBJECT: HOIS T HOOK ASSEMBLY P/N HK-118-2, INSPECTION OF.

REASON: To avoid loss of hoist hook assembly P/N HK-118-2 installed on hoist P/N 412-

8800 -01 -202 (Breeze Eastern P/N BL-20200-402); hoist P/N 412-8800-01-412
(Bre eze Eastern P/N BL-20200-412).

HELICOPTERS AFFECTED:
Agusta AB412 and AB412EP helicopters.

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

DESCRIPTION:
It is reported to Agusta a case of separation of Hook P/N HK-118-2. The investigation
perfor med revealed that the nut P/N BL -10892 and housing hook P/N BL-9197 were not
properly screwed (ref. Figure 1). In this condition the two locking screws were not insert into

the slot in housing. The purpose of this Bollettino is to provide the instructions to verify that
the nut and housing hook are properly screwed.B.T. 412-132

P age 2 of 8 MANPOWER REQUIRED:
Approximately 0,5 man-hour is required to carry out the inspection with feeler gauge.

WARRANTY: N.A. MATERIAL REQUIRED:

P/N DENOMINATION Q.TY

MS

- 24665

- 88 (*) Cot ter pin 2
Note: (*) Required only if it is necessary disassembly/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

- 03-004 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 source and/or the external power supply.

4. Using a feeler gauge (thickness 0,5 mm) carry out the hook check positioning feeler gauge on

the ha ndwheel a s illustrated in Figure 2

.

a. If feeler gauge can not be inserted (ref. Figure 2), this indicates that nut and housing
hook are properly screwed . No other action is required, pr oceed in accordance with

step 19.

b. If feeler gauge can be inserted (ref Figure 3), this indicates that nut and the housing

hook are not screwed. In this case proceed in ac cordance with following step s 5 ÷18

. 5. With reference Figure 4 pull up on bumper assembly (10), and slide it along hoist cable.

6. Remove cotter pins (60) and locking screws (70) from nut (80).

7. While holding hook housing (180), unthread and slide nut (80) along hoist cable.

8. Remove ring (100) from terminal clamp (90) and then remove terminal clamp (90) and nut
(80).B.T. 412-132

Page 3 of 8 9. With reference Figure 4 and 5 r ei nstall nut (80) with terminal clamp (90), onto ball end of
hoist cable, and secure terminal clamp with ring (100).

10. Slide nut (8 0) down until terminal clamp (90) seats in nut (80). In accordance with Figure 5
verify that terminal clamp (90) and ring (100) are correctly seats in nut (80).

11. Thread hook housing (180) with hook parts onto nut (80), until bottomed.

12. Back off nut (80) to line holes with next nearest slots in hook housing (180). Insert locking
screws (70) and screw home to bottom of slot in hook housing (180), and then secure locking
screw in place with new cotter pins (60) P/N MS-24665 -88

. 13. Slide bumper assembly (10) down and seats in nut (80).

14. Restore the power to the hoist, and proceed in accordance with following steps.

15. Run hoist to slowly pay out cable until the hook can 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. Using a feeler gauge (thickness 0,5 mm) carry out the hook check positioning feeler gauge on

the handwheel as illustrated in Figure 2

.

a. If it can not be inserted (ref. Figure 2), this indicates that nut and housing hook are
properly screwed . No other action is required, proceed in accordance with step 20.

b. If it can be insert ed

(ref Figure 3), this indicates that nut and the housing hook are not
screwed, in this case disconnect the 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. 412-132

Page 4 of 8 Figure 1

– HK -118 -2 Hook assembly NUT P/N BL

- 10892

HOUSING HOOK P/N BL

- 9197B.T. 412-132

Page 5 of 8 Figure 2 - HK -118 -2 Hook assembly
This condition indicated that nut and housing hook are screwed NUT

NO PRESS FEELER GAUGE TO INSERT BETWEEN NUT AND HANDWHEEL HANDWHEELB.T. 412-132

Page 6 of 8 Figure 3 - HK -118 -2 Hook assembly

This condition indicated that nut and housing hook are not screwed NUT

FEELER GAUGE INSERTED HANDWHEELB.T. 412-132

Page 7 of 8 Figure 4

– HK -118 -2 Hook AssemblyB.T. 412-132

Page 8 of 8 Figure 5

– Terminal clamp installation HOIST CABLE

NUT (80)

RING (100) TERMINAL CLAMP (90)Note:

Remarks:

Informazioni: Information:

A l fine di gestire le varianti alla configurazione base, in relazione all’emissione del Bollettino Tecnico, preghiamo di voler compilare il presente modulo in tutte le sue parti e spedirlo all’indirizzo sopra indicato. Si ringrazia 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:

N umero: Number:

R evisione: Revision: P rego spedire a questo indirizzo: Please send to the following address: 

### AGUSTA W ESTLAND S.p.A.
CUSTOMER SUPPORT & SERVICES - ITALY
P RODUCT SUPPORT ENGINEERING DPT.
Via del Gregge, 100
2101 5 Lonate Pozzolo (VA) - ITALY Tel.: +39 0331 664600 Fax: +39 0331 66468 4

Telefono: Telephone:

F ax:

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

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