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MODEL AFFE.CTED: 

SUBJECT: 

HE !COPTERS AFFEC'fiED: 

COMPLIANCE: 

D ESC Rl PTION: 

ALERT SE VICE BULLETIN 

N". 430-DD-17 

05-19-00 

PAGE 1 Of 6 

Mode1430 

HYDRAUliC ACTUATOR SUPPORT PIN 2:22-&40-

125-'001 I INSPECTION OF 

Model 430 helicopters serial number 49001 through 

49064 

Model 430 helrcopters Serial Number 49065 and 

subsequent will have the intent of this bulletin 

accomplished prior to delivery. 

lMthin 25 hours fol owing recaip of his bul etin. 

A Modei222U helicopter was 1n flight when it experienced a control loss. The cause of 

control loss was attributed 0 the main rotor hydraul ic actuator support separating from 

the transmission. All retaining studs were found sheared or pulled out at lhe junction of 

the support with the transm1ssio upper and lower cases. 

The purpose of thiS bulletin is to require a one-time inspection of the hydraulic 

actuators support installation by accomplishing a torq e check of the support attaching 

nuts. ln addition. a Revision to the maintemmDe manual will introduce a recurring 

torque check o· the support attaching hardware. 

APPROVAL: 

No required 

Approx·mately 

MANPOWER: 

.5 man-hour is required to oomplet this bulletin if e support is not 

~ ~ removed from lhe transmassion. An additional 6 man-hours will be required to remove, ~ inspect and reinstall the support. Man-hours are based on hands-on time, and may ~ vary with personnel and fa_c_ili_ti_es_ av_a_il_a....:.. ble __ ________________ ...... ~ 

At. Arfl4 1 • !AlE E. IR~ l'lAJ',. t • 1:! "·'" tl'<l .U.•. L 'i 11:."'4 ,... 

_ Ill 
430-00-17 

Page 2 of 6 

MATERIAL: 

Required Material: 

The following material is required for the accomplishment of this bulletin and may be 

obtained through your Bell Helicopter Textron Supply Center. 

Part Number Nomenclature Quantity 

* MS21042L4 Nut 4 

* MS21 042L5 Nut 4 

* 222-040-268-001 Washer 4 

* 222-040-268-003 Washer 4 

* Nuts 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 Reference 

* MILS8784CLB2 Sealant 3.50Z C-328 

* Sealant is required only if actuator support is removed for inspection. 

SPECIAL TOOLS: 

None required 

WEIGHT AND BALANCE: 

Not affected 

ELECTRICAL LOAD DATA: 

Not affected 
REFERENCES: 

BHT-430-MM-6, Chapter 63 

BHT-430-MM-9, Chapter 71 

BHT-430-CR&0-2, Chapter 63 

BHT-ALL SPM 

PUBLICATIONS AFFECTED: 

BHT -430-MM-2, Chapter 5 

BHT-430-CR&0-2, Chapter 63 

ACCOMPLISHMENT INSTRUCTIONS: 

430-00-17 

Page 3 of 6 

1. Remove fairings and cowlings as required to gain access to the hydraulic actuators 

support. Refer to BHT-430-MM-9, 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 BHT-430-MM-6, 

Chapter 63 and BHT-430-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 BHT -430-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. 
430-00-17 

Page 4 of 6 

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 BHT-430-CR&0-2, Chapter 63 for 

damage/wear limits. 

b) Inspect the studs, retaining the actuators support, for condition of threads and 

for looseness. Replace damaged studs in accordance with BHT-430-CR&0-2, 

Chapter 63 and BHT-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 BHT-430-CR&0-2, 

Chapter 63 and BHT-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 BHT-430-CR&0-2, Chapter 

63. Reinstall all parts previously removed in accordance with BHT-430-MM-6, 

Chapter 63. 

9. Reinstall fairings and cowlings previously removed. Refer to BHT-430-MM-9, 

Chapter 71. 

10. Annotate helicopter records to reflect compliance with this bulletin. 
0.343 - 0.350 IN Dia. 

(8. 71 - 8.89 mm) 

Hydraulic Actuator Support Assembly 

P/N 222-040-125-001 

Figure 1 

430-00-17 

Page 5 of 6 

ILL00101 
430-00-17 

Page 6 of 6 

DOWEL PINS 

Transmission Top Case Assembly 

PIN 430-040-061-101 

Figure 2 

ILL00103