### ALERT 

### SERVICE BU LETIN 

## Be I

MODEL AFFECTED: 

### SU I BJIECT:

HELICOPTERS AFFECTED:

COMPLIANCE: DESCRIPTION: NO DI\TE**P~E**

Model 2.22 and 222B 

### 222eOO..S6 05-1'9-00 

### 1 of&

HYDRAUUC ACTUATOR SUPPORT PIN 222...040·· 125-D

### 01! INSPECTIO , OF Model 222 se**liia~** n 1 Umber 47006 through 47089. Mod I 222B s, rial number 47131 through 4715ti. 

### Wiithrin 25 

### hours following 

### re-ceipt ofthis**bu~letin .** 

A Model 22.21J helicopter was in ·flright when 

### it experienced a controllos.s. The cause of control loss was attributed to the main rotor hydraulic actuator support separating from the transmission. All retaining studs were found sheared or pulled out at the junction of the support with the transmission upper and lower cases. The purpose o· his bulletin is to requi re a one-time inspection. of the hydra ultc actuators support instaliation by accomplishing a torque chec ofthe support , attach ing nuts. In addition . a Revision to the maintenance manual wi ll introduce a recurring torque check ofthe support attaching nuts. 

### APPROVAL: Not required 

### MA POWER: Approximately .5 man hour is req uired to complete this b lletin 

### if the support l:s not removed from the transm$5ion. An additional6 man-hours 

## wm be required to remove, inspact and reinstall the support**Man~hours** are based on hands-on time, and may vary with personnel and facilities availabla.**IIAL-~** "4 lt t AI IK •I AI' r- • r'' NNF F 

# Ill'222-00-86 Page 2 of 6 MATERIAL : Required Material: The following material is required for the accomplishment of this bulletin and may be obtained through you r Bel l Helicopter Textron Supply Center. Part Number Nomenclature Quantity * MS21042L4 Nut 4 * MS21042L5 Nut 4 * 222-040-268-001 Washer 4 * 222-040-268-003 Washer 4 * Nuts and washers are required only if actuator support is removed for inspection . Consumable Material: The following material is required to accomplish this bulletin , but may not require ordering , depending on the operator's consumable material stock levels . This material may be obtained through your Bell Helicopter Textron Supply Center. Part Number Nomenclature Quantity * MILS8784CLB2 Sealant 3.50Z * Sealant is required only if actuator support is removed for inspection. SPECIAL TOOLS: None required WE IGHT AND BALANCE : Not affected ELECTRICAL LOAD DATA: Not affected REFERENCES: BHT-222/222B-MM-1, Chapter 66 and 71 BHT-222-CR&0-2 , Chapter 63 BHT-ALL SPM Reference C-328PUBLICATIONS AFFECTED: 8HT-222/2228-MM-1 , Chapter 5 8HT-222-CR&0-2 , Chapter 63 ACCOMPLISHMENT INSTRUCTIONS: 

### 222- 00-86 Page 3 of 6

1. Remove fairings and cowlings as required to gain access to the hydraulic actuators support. Refer to 8HT-222/2228-MM-1 , Chapter 71. 2. Verify that the dowel pins installed in the transmission upper case are not missing and that evidence of sealant is present at the joint between the actuator support and the transmission. Refer to figure 2. If any of the pins are missing and/or if no sealant is visible , remove the actuator support and proceed to step 5. 3. Verify torque of actuators support P/N 222-040-125-001 attaching nuts . Apply the torque in the tightening direction . For the upper row of nuts , if 40 in. lb . is reached without nut movement, increase the torque to 50-70 in .lb plus tare . For the lower row of nuts, if 90 in. lb . is reached without nut movement, increase the torque to 100-140 in.lb plus tare . -NOTEAnti fretting washers installed between the actuator support and the transmission lower case may be reinstalled provided

.the coating is not worn through or damaged 4. If two or more of the nuts within the upper row of the support attaching nuts move below 40 in.lb torque or two or more of the nuts within the lower row of the support attaching nuts move below 90 in.lb torque , remove the hydraulic actuators support from the transmission for further inspection and repair. Refer to 8HT-222/2228- MM-1 , Chapter 65 and 8HT-222-CR&0-2 , Chapter 63 for removal instructions. Discard nuts and washers. 5 . If required , inspect the support P/N 222-040-125-001 in accordance with . instructions in 8HT-222-CR&0-2 , Chapter 63. The holes at the lower and upper end of the support were manufactured to the dimensions shown in figure 1 . 6. If required, inspect the transmission lower case assembly as follows : a) Inspect surface of transmission case in contact with the actuator support for damage, fretting and corrosion . Refer to 8HT-222-CR&0-2 , Chapter 63 for damage/wear limits.

### 222-00-86 Page 4 of 6 b) Inspect the studs , retaining the actuators support, for condition of threads and for looseness. Replace damaged studs in accordance with 8HT-222-CR&0-2 , Chapter 63 and 8HT-ALL-SPM . 7. If required , inspect the transmission upper case assembly as follows: a) Inspect surface of transmission case in contact with the actuator support for damage, fretting and corrosion. Maximum depth and/or size of corrosion , wear, scratches , nicks and marks shall not exceed 0.005 inch depth , 40% of any one square inch or more than 20% of the total surface . Pitting/corrosion around studs and dowel pins shall not exceed 0.005 depth or 50% of the circumference of the stud/dowel pin . b) Inspect the studs , retaining the actuators support, for condition of threads and for looseness . Replace damaged studs in accordance with 8HT-222-CR&0-2 , Chapter 63 and 8HT-ALL-SPM . c) Inspect the dowel pins in transmission case for damage , fretting , corrosion and looseness. The large outboard pins should measure 0.500 inch minimum and protrude 0.55 inch from the surface of the case. The small inboard pins should measure 0.375 inch minimum and protrude 0.45 inch from the surface of the case . Refer to Figure 2 8. If removed for inspection , reinstall actuators support on the transmission with new nuts and washers in accordance with instructions in 8HT-222-CR&0-2 , Chapter 63 . Reinstall all parts previously removed in accordance with 8HT-222/2228-MM1 , Chapter 66 . 9 . Reinstall fairings and cowlings previously removed. Refer to 8HT-222/2228-MM-1 , Chapter 71 . 10. Annotate helicopter records to reflect compliance with this bulletin .

### . 

# .

0.5008 - 0.5013 IN Dia . (12.72 - 12 .73 mm)

0.343 - 0.350 IN Dia. (8 .71 - 8 .89 mm) Hydraulic Actuator Support Assembly P/N 222-040-125-001 Figure 1 222-00-86 Page 5 of 6

0.5008 - 0.5013 IN Dia. (12.72 - 12.73 mm)

ILL00101

### 222-00-86 Page 6 of 6

DOWEL PI NS 

### Transmission Top Case Assembly P/N 222-040-061-101 through 105 Figure 2 

# . .

I LL00102