DATE ALERT SERVICE BULLETIN

REVISION NOTICE

AN APPROPRIATE ENTRY SHOULD BE MADE IN TH E AIRCRAFT LOGBOOK UPON ACCOMPLISHMENT

IF OWNERSHIP OF AIRCRAFT HAS CHANGED PLEASE FORWARD TO NEW OWNER Jan 10, 2011

TO: All Owners/Operators of 210 Helicopters

SUBJECT: REVISION “B” TO ALERT SERV ICE BULLETIN 210-08-03, MAIN

ROTOR BLADE P/N 210-015-00 1-101, INSPECTION OF.

Revision “B” to this bulletin is being i ssued to change the inspection interval and procedure. Changes were made to the following paragraphs: “HELICOPTERS AFFECTED”, “COMPLIANCE” AND “A CCOMPLISHMENT INSTRUCTIONS”.NO.

DATE

PAGE DATE

REV 

### ALERT SERVICE BULLETIN

AN APPROPRIATE ENTRY SHOULD BE MADE IN TH E AIRCRAFT LOGBOOK UPON ACCOMPLISHMENT

IF OWNERSHIP OF AIRCRAFT HAS CHANGED PLEASE FORWARD TO NEW OWNER 210-08-03

Jan 10, 2010 Dec 22, 2008

B 1 of 6

MODEL AFFECTED: 210

SUBJECT: MAIN ROTOR BL ADE P/N 210-015-001-101,

INSPECTION OF.

HELICOPTERS AFFECTED: Model 210 helicopters serial number 21001, 21002, 21003 and 21004.

COMPLIANCE : Within the next 25 hours after rece ipt of this bulletin and every 25 hours of operation thereafter

.

DESCRIPTION:

A model 212 Main Rotor Blade P/N 212- 015-501-115 with approx imately 1000 hours total time was recently returned to BHTI for evaluation. The blade was found cracked through the blade retention bolt hole at Blad e Station 28.0 and an other crack through

the lower doublers at Bl ade Station 36.0. T he main rotor blade contained a fatigue fractured grip plate, fatigue fractured doublers and a fatigue cracked spar on the

bottom of the blade as a result of i nadequate bond between th e doublers and grip plate. Further analysis and investigation of two more blades with similar defects required the introduction of a recurring inspec tion of the Main Rotor Blade every 25 hours of operation. Refer to Figures 1 for the inspection area and Figure 2 showing typical cracks. As the 210-015-001-101 Main Rotor Blade on the Model 210 is virtually the same as the reference 212 Main Rotor Blade, this bulletin also applies to

the 210 Main Rotor Blade.

APPROVAL:

The engineering design aspects of th is bulletin are FAA/DER approved.

MANPOWER:

Approximately 1.0 man-hour is required to complete this bulletin. Man-hours are based on hands-on time, and may vary wit h personnel and facilities available. B

BASB 210-08-03 Page 2 of 6

WARRANTY:

There is no warranty provided for this bulletin.

MATERIAL:

Required Material:

None required

Consumable Material: The following material is required to acco mplish this bulletin, but may not require ordering, depending on t he operator’s consumable material stock levels. This material may be obtained through your Bell He licopter Textron Supply Center.

Part Number Nomenclature Quantity Reference

MILC87936TY1 Cleaning Co mpound 1 liter C-318

WD-40

TT-1735 ISOPROPYL Preservative Oil Isopropyl Alcohol 12 OZ As required C-125

C-385

SPECIAL TOOLS:

None required

WEIGHT AND BALANCE:

Not affected

ELECTRICAL LOAD DATA:

Not affected

REFERENCES:

Bell Model 210 Illustrated Parts Breakdown

Bell Model 210 Maintenance Manual Bell Model 210 Component Repa ir and Overhaul Manual BASB 210-08-03 Page 3 of 6

PUBLICATIONS AFFECTED:

210 MM Maintenance Manual

ACCOMPLISHMENT INSTRUCTIONS:

1. Wash upper and lower Main Rotor Blade surfaces with a solution of cleaning compound (C-318) and water. Rin se thoroughly and wipe dry.

-NOTEAccomplishment of this inspection does not require removal

of the blades from the Main Rotor Hub.

2. Inspect the Main Rotor Blade upper and lower grip plates and doublers for their entire length and chord width. Inspect for signs of cracks, corrosion and edge voids, paying particular attention to t he bond lines between doublers, grip plates and skin. Hair line cracks in the paint finish should be suspect for possible

cracks / voids.

3. Wipe the area to be inspected with an alcohol-soaked cloth (C-385) and wipe dry with a clean cloth.

NOTE

Accomplish Step 4 of this AS B immediately after carrying out the above alcohol wipe. Any potential cracks in the bond lines between doublers or grip plates will indicated by the presence of excess alc ohol bleeding out of an edge

void. This excess alcohol in the void will a ppear as a dark

line between the bond lines of the doublers.

CAUTION

Pay particular attention not to remove any parent material

from the skin / doublers during sanding operation.

4. Carry out a detailed visual inspection of the top and bottom inspection areas of the blade using a 3X-power magnifying glass and a strong light source. Check

for evidence of a dark line between doublers , grip plates and skin with excess alcohol bleeding out of the possible edge voids. Any cr acks in the finish must B

B

BASB 210-08-03 Page 4 of 6

be investigated further by removing paint in the affected areas (sand with 180- 220 grit paper in a spanwise direction) to determine if the grip plate / doublers are cracked or voided. Any crack in pa int finish which follows grip plate / doubler outline may indicate a possible edge void.

5. If cracks in grip plate / doublers are are found, the affected blade must be immediately removed from service. If no cr acks are detected, cont inue with Step 6.

CAUTION

Pay particular attention not to remove any parent material

from the skin / doublers during sanding operation.

6. If edge voids between grip plate / doubler s / skin are found, determine depth and length by using 0.0015 in. feeler gage. If edge voids are near ou tboard tip of grip plate / doublers, also carefully tap ins pect suspect area. Refer to BHT-210-CR&O, 62-8 thru 62-10 for void repair limits and in spection/repair instructions. If no voids
are detected, cont inue with Step 7.

7. Refinish the sanded area as per BHT-210-CR&O.

8. Following the inspec tion, apply a light coat of preservative oil (C-125) to all

surfaces of blade.

9. Annotate records to indicate findi ngs and compliance with this bulletin. B

BASB 210-08-03 Page 5 of 6

Figure 1 Inspection Area 

### Station

24.5 Station

85ASB 210-08-03 Page 6 of 6

Figure 2

Crack Indications