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, 2012 

REV.

Compliance with

this bulletin is:

SUBJECT: HOIST 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 

(Breeze 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 disassembled/reassembled. 

DESCRIPTION:

It is reported to Agusta a case of separation of Hook P/N HK-118-2. The investigation 

performed 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. 

MANDATORY

An appropriate entry should be made in the aircraft log book upon accomplishment.

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

AgustaWestland S.p.A

Via Giovanni Agusta, 520

21017 Cascina Costa di Samarate (VA) Italy

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

ALERT

ALERT
B.T. 412-132

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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 (*) Cotter 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 handwheel as 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, proceed 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 accordance with following steps 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

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9. With reference Figure 4 and 5 reinstall nut (80) with terminal clamp (90), onto ball end of 

hoist cable, and secure terminal clamp with ring (100). 

10. Slide nut (80) 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 inserted (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

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Figure 1 – HK-118-2 Hook assembly 

NUT P/N BL-10892

HOUSING HOOK 

P/N BL-9197
B.T. 412-132

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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

HANDWHEEL
B.T. 412-132

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Figure 3 - HK-118-2 Hook assembly 

This condition indicated that nut and housing hook are not screwed 

NUT

FEELER GAUGE 

INSERTED

HANDWHEEL
B.T. 412-132

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Figure 4 – HK-118-2 Hook Assembly 
B.T. 412-132

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Figure 5 – Terminal clamp installation 

HOIST CABLE

NUT (80)

RING (100)

TERMINAL CLAMP (90)
Note: 

Remarks:

Informazioni: 

Information:

Al 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:

Numero: 

Number:

Revisione: 

Revision:

Prego spedire a questo indirizzo: 

Please send to the following address: 

AGUSTAWESTLAND S.p.A. 

CUSTOMER SUPPORT & SERVICES - ITALY

PRODUCT SUPPORT ENGINEERING DPT.

Via del Gregge, 100

21015 Lonate Pozzolo (VA) - ITALY 

Tel.: +39 0331 664600

Fax: +39 0331 664684

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.