THIS ALERT SERVICE BULLETIN IS THE PROPERTY OF SIKORSKY AIRCRAFT CORPORATION AND IS PROTECTED UNDER THE COPYRIGHT LAWS OF THE 

UNITED STATES AND OTHER COUNTRIES. THIS ALERT SERVICE BULLETIN IS DISTRIBUTED ONLY TO OWNERS/OPERATORS OF COMMERCIALLY-CERTIFIED 

SIKORSKY HELICOPTERS AND SIKORSKY-AUTHORIZED LOGISTIC AND SERVICE CENTERS FOR THE PURPOSE OF FOSTERING THE SAFE AND EFFICIENT 

OPERATION OF SUCH HELICOPTERS AND UNDER THE EXPRESS CONDITION THAT THE CONTENTS OF THIS ALERT SERVICE BULLETIN ARE NOT TO BE 

DISCLOSED. REPRODUCED. OR DISTRIBUTED. IN WHOLE OR IN PART, TO ANY THIRD PARTY. OR ADAPTED AS A DERIVATIVE WORK. WITHOUT THE 

EXPRESS DOCUMENTED CONSENT OF SIKORSKY AIRCRAFT CORPORATION. ANY ACT IN VIOLATION OF APPLICABLE LAW MAY RESULT IN CIVIL AND/OR 

CRIMINAL PENAL TIES. 

LIMITED DISTRIBUTION e SIKORSKY AIRCRAFT CORPORATION 1999 

ALL RIGHTS RESERVED 

No. 61 B35-69 

Subject: ROTORS - Main Gear Box - Main Rotor Shaft - Establishment of New Retirement Time 

for Main Rotor Shafts (MRS) used in Repetitive External Lift (REL) and Non-Repetitive 

External Lift (Non-REL) Operations. 

1. PLANNING INFORMATION 

A. Effectivity 

Model: S-61 L, N, NM (61454), and R series transport category helicopters. 

S-61 A, D, E, and V series restricted category helicopters. 

All H-3 Military helicopters. 

Component: S6135-20640-001, S6135-20640-002, and S6137 -23040-001 MRS. 

B. Purpose 

NOTE: This Alert Service Bulletin (ASB) 61B35-69 supersedes Alert Service Bulletin ASB 

61 B35-68B, in its entirety. 

To establish new retirement life for MRS used in REL and Non-REL operations. The new 

retirement life will require the operator to track both flight hours and Lift Cycles. 

New MRS to be utilized in REL operations, as well as currently fielded REL MRS, which 

are presently assigned a retirement life of 2,000 flight hours, will be assigned a new 

retirement life of 5,000 flight hours or 30,000 Lift Cycles, whichever occurs first. 

New MRS to be utilized in Non-REL operations, as well as currently fielded Non-REL MRS 

which are presently assigned a retirement life of 42,000 flight hours, will be assigned to a 

new retirement life of 13,000 flight hours. 

C. Description 

Helicopter records are reviewed to determine the currently assigned retirement times for 

the MRS. If necessary, calculations are made to determine the number of Lift Cycles 

accumulated on the MRS. Disposition instructions are provided on how to implement these 

new times. Appropriate log card entries are made to comply with the new retirement times. 

April 19/04 Page 1 of 18 
Compliance is essential. The work outlined herein is to be accomplished within five days from 

the issue date of this ASB. 

E. Approval 

The technical aspects of this Alert Service Bulletin are FAA approved. 

F. Manpower (Estimated) 

Physically identify REL 

components: 

No. of Men 

1 

No. of Hours 

1.0 

Man-Hours 

1.0 

NOTE: Does not include removal time, disassembly and reassembly of components to be identified. 

G. Material 

None 

H. Tooling Required 

None 

I. Electrical Load Data 

Not affected 

J. Weight and Balance 

None 

April 19/04 Page 2 
Service Bulletin No. 61 B General-1, latest revision, 

(Time Limits, Establishment of Serialization of Parts with Mandatory Retirement Times) 

Service Bulletin No. 61 B35-53, latest revision, 

(Main Gear Box, Planetary Plates, Matched Set, Replacement of) 

Service Bulletin No. 61 B35-68, latest revision, 

(Main Gear Box - Main Rotor Shaft - Establishment of New Retirement Time for Main Rotor 

Shafts (MRS) used in Repetitive External Lift (REL) and Non-Repetitive External Lift (Non-REL) 

Operations)) Customer Service Notice No. 6135-10, latest revision, 

(Main Gear Box, Planetary Assembly and Main Shaft Assembly, Improvements to) 

Federal Aviation Administration Airworthiness Directive AD 98-26-02. 

L. Publications Affected 

None 

2. MATERIAL INFORMATION 

QTY 

A. Consumable Material 

None 

WARNING I OBSERVE ALL CAUTIONS AND WARNINGS ON CONTAINERS WHEN USING CONSUMABLES. WHEN APPLICABLE, WEAR NECESSARY 

PROTECTIVE GEAR DURING HANDLING AND USE. IF A 

CONSUMABLE IS FLAMMABLE OR EXPLOSIVE, MAKE CERTAIN 

CONSUMABLE AND ITS VAPORS ARE KEPT AWAY FROM HEAT, 

SPARK, AND FLAME. MAKE CERTAIN FIREFIGHTING EQUIPMENT IS 

READILY AVAILABLE PRIOR TO USE. FOR ADDITIONAL 

INFORMATION ON TOXICITY, FLASHPOINT, AND FLAMMABILITY OF 

CHEMICALS, CONSULT YOUR MEDICAL PEOPLE, OR THE 

MANUFACTURER OF THE CONSUMABLE. 

DESCRIPTION 

ACID-ETCHING INK 

TYPE 

NO. 22 

OR EQUIVALENT 

(Manufactured by Matthews International, Identification System Div., 1315 W. Liberty Ave., Pittsburgh, PA 

15226) 

April 19/04 Page 3 
retirement life as noted in accomplishment instructions in section 3.A., (1 ),(2),(3), and (4) and 

illustrated in Flowchart A. 

• For Non-REL MRS which did not previously comply with ASB 61B35-68B, create a log card 

for the MRS and make an appropriate log card entry on the MRS and MGB log cards to 

indicate the MRS total accumulated flight hours. If the total time on the MRS cannot be 

determined, annotate the log card to indicate the MRS has a total operating time of 12,500 

flight hours and a retirement life of 42,000 flight hours. Refer to section 3.A., (4). 

• For MRS previously reworked in accordance with Overhaul and Repair Instructions (ORI) No. 

6135-281, Part B, Step 5 or ORI 6137-041, Section Ill, Oversize Dowel Pin Bore Repair and 

identified as TS-281 or TS-041-3. Comply as stated: 

• For an uninstalled MRS or a MRS that is in the overhaul/repair cycle, annotate the log card 

that the MRS is to be retired immediately, regardless of accumulated flight hours. 

• For an installed MRS with less than a total of 700 flight hours accumulated from the released 

date of this ASB, annotate the log card(s) to indicate the MRS is to be retired upon 

accumulating 700 total flight hours, or at the next MGB overhaul, or within six calendar months 

from the issue date of this ASB, whichever occurs first. 

• For an installed MRS with more than a total of 700 flight hours accumulated from the release 

date of this ASB, annotate the log card(s) to indicate that the MRS is to be retired within 50 

flight hours, or at the next MGB overhaul, or within six calendar months from the issue date of 

this ASB, whichever occurs first. 

(1) MRS currently assigned a 535 flight hour retirement life, refer to the following and 

Flowchart B: 

(a) For an uninstalled MRS or a MRS that is in the overhaul/repair cycle, annotate the log 

card(s) to indicate that the MRS is to be retired immediately, regardless of accumulated 

flight hours. 

(b) For an installed shaft, annotate the log card(s) to indicate that the MRS is to be retired 

upon accumulating 535 total flight hours, or at the next Main Gear Box (MGB) 

overhaul, or within six calendar months from the issue date of this ASB, whichever 

occurs first. 

(2) MRS currently assigned a 1 ,500 flight hour retirement life, refer to the following and 

Flowchart C: 

April 19/04 Page 4 
travel, approach to hover, release of load and then land, or release of load and then 

depart. 

When the average number of Lift Cycles exceeds six per flight hour (greater than six) 

during any 250 flight-hour period (greater than six) based on a Moving Average -

calculated at intervals not to exceed 50 hours of operation), this is defined as 

Repetitive External Lift (REL) operation. Operations whose moving average Lift Cycles 

per hour is six or less (less than six or equal to six) are designated as Non-REL. 

(a) Annotate the log card(s) to indicate a new retirement life of 1,500 flight hours or 

30,000 Lift Cycles, whichever occurs first. 

NOTE: The total number of accumulated Lift Cycles can be the sum of any known Lift 

Cycles and calculated Lift Cycles. 

(b) Determine the total number of accumulated Lift Cycles on the MRS since new. If the 

total number of accumulated Lift Cycles on the MRS is known, annotate the log card(s) 

with the known number of accumulated Lift Cycles. If the total number of actual Lift 

Cycles is not known, calculate the number of accumulated Lift Cycles by multiplying the 

number of accumulated flight hours on the MRS by 30. 

For example: 

A new main rotor shaft was initially operated for 500 flight hours with the Lift Cycles 

being tracked by the operator and the accumulated known Lift Cycles totaled 11,000. 

The same shaft was then operated for 800 flight hours without the Lift Cycles being 

tracked. The operator must calculate the number of accumulated Lift Cycles on the 

shaft during that 800 hours of operation by assuming a Lift Cycle rate of 30/hour, (i.e., 

800 flight hours multiplied by 30 equals 24,000 calculated Lift Cycles). Therefore the 

total accumulated Lift Cycles on this shaft would be 35,000 (i.e., 11 ,000 known Lift 

Cycles plus 24,000 calculated Lift Cycles) and the log card(s) would be annotated to 

show 35,000 Lift Cycles as the total accumulated. 

(c) If the total number of Lift Cycles annotated on the log card(s) exceeds 30,000, comply 

with the following: 

1 For an uninstalled MRS or a MRS that is in the overhaul/repair cycle, annotate the 

log card(s) to indicate that the MRS is to be retired immediately regardless of flight 

hours accumulated. 

2 For an installed shaft, annotate the log card(s) to indicate that the MRS is to be 

retired upon accumulating 1,500 flight hours, or at the next MGB overhaul, or within 

six calendar months from the issue date of this ASB, whichever occurs first. 

(d) If the total number of Lift Cycles annotated on the log card(s) is less than 30,000, 

comply with the following: 

April 19/04 Page 5 
within six calendar months from the issue date of this ASB, whichever occurs first. 

(e) If the MRS has accumulated less than 1,500 flight hours and 30,000 Lift Cycles, the 

MRS can be assigned a new retirement life of 5,000 flight hours or 30,000 Lift Cycles 

provided that the MRS is installed in a MGB that has incorporated CSN 6135-10, latest 

revision and SB 61835-53, latest revision. Upon installing the MRS in a MGB modified 

by the referenced CSN and SB, annotate the log card(s) to indicate that the MRS is to 

be removed from service upon accumulating 5,000 flight hours or 30,000 Lift Cycles, 

whichever occurs first. 

(3) MRS currently assigned a 2,000 flight hour retirement life (or 2,200 flight hours assigned 

per AD 98-26-02), refer to the following and Flowchart D: 

NOTE: An external Lift Cycle is defined as the accomplishment of an external load lift, 

enroute travel, approach to hover, release of load and then land, or release of 

load and then depart. 

When the average number of Lift Cycles exceeds six per flight hour (greater than 

six) during any 250 flight-hour period (based on a Moving Average - calculated at 

intervals not to exceed 50 hours of operation), this is defined as Repetitive 

External Lift (REL) operation. Operations whose moving average Lift Cycles per 

hour is six or less (less than six or equal to six) are designated as Non-REL. 

(a) Annotate the log card(s) to indicate a new retirement life of 5,000 flight hours or 

30,000 Lift Cycles, whichever occurs first. 

(b) Determine the total number of accumulated Lift Cycles on the MRS since new. If the 

total number of accumulated Lift Cycles on the MRS is known, annotate the log card(s) 

with the known number of accumulated Lift Cycles. If the total number of Lift Cycles is 

not known, calculate the number of accumulated Lift Cycles by multiplying the number 

of flight hours accumulated on the MRS by 30. 

For example: 

A new main rotor shaft was initially operated for 500 flight hours with the Lift Cycles 

being tracked by the operator and the accumulated known Lift Cycles totaled 11 ,000. 

The same shaft was then operated for 800 flight hours without the Lift Cycles being 

tracked. The operator must calculate the number of accumulated Lift Cycles on the 

shaft during that 800 hours of operation by assuming a Lift Cycle rate of 30/hour, ( 

i.e., 800 flight hours multiplied by 30 equals 24,000 calculated Lift Cycles). Therefore 

the total accumulated Lift Cycles on this shaft would be 35,000 (i.e., 11,000 known Lift 

Cycles plus 24,000 calculated Lift Cycles) and the log card(s) would be annotated to 

show 35,000 Lift Cycles as the total accumulated. 

(c) If the total number of Lift Cycles annotated on the log card(s) exceeds 30,000, comply 

with the following: 

April 19/04 Page 6 
log card(s) to indicate that the MRS is to be retired immediately regardless of flight 

hours accumulated. 

2 For an installed shaft: 

a If the accumulated Lift Cycles exceeds 30,000 but is less than 57,000 Lift Cycles, 

annotate the log card(s) to indicate that the MRS is to be retired upon 

accumulating 5,000 flight hours or 57,000 Lift Cycles, or at the next MGB 

overhaul, or within six calendar months from the issue date of this ASB, 

whichever occurs first. 

b If the accumulated Lift Cycles exceeds 57,000, annotate the log card(s) to indicate 

that the MRS is to be retired within 50 flight hours or at the next MGB overhaul 

or within six calendar months from the issue date of this ASB, whichever occurs 

first. 

(d) If the total number of Lift Cycles annotated on the log card(s) is less than 30,000, 

comply with the following: 

1 Continue tracking flight hours and Lift Cycles and retire MRS from service upon 

accumulating 5,000 flight hours or 30,000 Lift Cycles, whichever occurs first. 

(4) MRS currently assigned a 42,000 flight hour retirement life, refer to the following and 

Flowchart E: 

April 19/04 

NOTE: An external Lift Cycle is defined as the accomplishment of an external load lift, 

enroute travel, approach to hover, release of load and then land, or release of 

load and then depart. 

When the average number of Lift Cycles exceeds six per flight hour (greater than 

six) during any 250 flight-hour period (based on a Moving Average - calculated at 

intervals not to exceed 50 hours of operation), this is defined as Repetitive 

External Lift (REL) operation. Operations whose moving average Lift Cycles per 

hour is six or less (less than six or equal to six) are designated as Non-REL. 

(a) Annotate the log card(s) to indicate a new retirement life of 13,000 flight hours. 

1 For MRS which were previously assigned a total operating flight time penalty of 

12,500 flight hours and a retirement life .of 42,000 flight hours in accordance with 

ASB 61 835-68, comply with the following: 

Subtract 8,500 flight hours from the existing flight hours accumulated on the MRS 

and annotate the log card(s) with the new flight hour total. Continue tracking flight 

hours and Lift Cycles and retire the MRS from service upon accumulating a total 

of 13,000 flight hours. 

Page 7 
ASS 61 835-68, comply with the following: 

a Continue tracking flight hours and Lift Cycles and retire the MRS from service 

upon accumulating a total of 13,000 flight hours. 

(b) If the total number of accumulated flight hours annotated on the log card(s) exceeds 

13,000 flight hours, comply with the following: 

1 For an uninstalled MRS or a MRS that is in the overhaul/repair cycle, annotate the 

log card(s) to indicate that the MRS is to be retired immediately. 

2 For an installed MRS, annotate the log card(s) to indicate that the MRS is to be 

retired at next MGB overhaul or within six calendar months from the issue date of 

this ASS, whichever occurs first. 

(c) If the total number of accumulated flight hours annotated on the log card(s) is less 

than 13,000 flight hours, comply with the following: 

1 Continue tracking flight hours and Lift Cycles and retire the MRS from service upon 

accumulating a total of 13,000 flight hours. 

(d) Non-REL operators are required to track Lift Cycles on an on-going basis to verify 

continued Non-REL operation and designation. When the average number of Lift Cycles exceeds six per flight hour (greater than six) during any 250 flight-hour period (based on a Moving Average - calculated at intervals not to exceed 50 hours of operation), 

this is defined as Repetitive External Lift (REL) operation. Operations whose moving 

average Lift Cycles per hour is six or less (less than six or equal to six) are 

designated as Non-REL. 

B. For a helicopter which transitions from Non-REL to REL operation as a result of the 

accomplishment of the moving average procedure, refer to the following and Flowchart F: 

NOTE: An external Lift Cycle is defined as the accomplishment of an external load lift, enroute 

travel, approach to hover, release of load and then land, or release of load and then 

depart. 

When the average number of Lift Cycles exceeds six per flight hour (greater than six) 

during any 250 flight-hour period (based on a Moving Average - calculated at intervals 

not to exceed 50 hours of operation), this is defined as Repetitive External Lift (REL) 

operation. Operations whose moving average Lift Cycles per hour is six or less (less 

than six or equal to six) are designated as Non-REL. 

(1) Annotate the MGB and MRS log card(s) to indicate a new MRS retirement life of 5,000 

flight hours or 30,000 Lift Cycles, occurs first. 

April 19/04 Page 8 
number of accumulated Lift Cycles on the MRS is known, annotate the log card(s) with 

the known number of Lift Cycles. If the total number of Lift Cycles is not known, calculate 

the number of accumulated Lift Cycles by multiplying the number of flight hours 

accumulated on the MRS by six. 

For example: 

If a shaft is initially operated for 1,000 flight hours without the Lift Cycles being tracked, 

multiply 1,000 flight hours by six. The total calculated Lift Cycles of 6,000 would then be 

annotated on the log card(s). 

(3) If the total number of accumulated flight hours and Lift Cycles are less than 5,000 and 

30,000 respectively, comply with the following: 

(a) If the MRS is installed in a MGB that has not incorporated CSN 6135-10, latest 

revision and SB 61835-53, latest revision, within ten flight hours following the transition 

to REL operation, the MGB must be modified to comply with the CSN and SB prior to 

continued operation. Continue tracking flight hours and Lift Cycles and retire MRS from 

service upon accumulating 5,000 flight hours or 30,000 Lift Cycles, whichever occurs 

first. 

(b) If the MRS is installed in a MGB that has incorporated CSN 6135-1 0, latest revision 

and SB 61 835-53, latest revision, continue tracking flight hours and Lift Cycles and 

retire MRS from service upon accumulating 5,000 flight hours or 30,000 Lift Cycles, 

whichever occurs first. 

(4) If the accumulated flight hours or Lift Cycles exceed 5,000 or 30,000 respectively, comply 

with the following: 

(a) For an uninstalled MRS or a MRS that is in the overhaul/repair cycle, annotate the log 

card(s) to indicate that the MRS is to be retired immediately. 

(b) For an installed MRS, comply with the following: 

1 If the total number of accumulated flight hours exceeds 5,000, regardless of the 

number of Lift Cycles, annotate the log card to indicate that the MRS must be 

retired from service within ten flight hours or at the next MGB overhaul or within six 

calendar months from the issue date of this ASB, whichever occurs first. 

2 If the total number of accumulated Lift Cycles exceeds 30,000, comply with the 

following: 

a If the MRS is installed in a MGB that has incorporated CSN 6135-10, latest 

revision and SB 61835-53, latest revision and the Lift Cycles exceed 30,000 but 

are less than 57,000 Lift Cycles, annotate the log card(s) to indicate that the MRS 

is to be retired upon accumulating 5,000 flight hours or 57,000 Lift Cycles, or at 

the next MGB overhaul, or within six calendar months from the issue date of this 

ASB, whichever occurs first. 

April 19/04 Page 9 
annotate the log card(s) to indicate that the MRS is to be retired within 50 flight 

hours or at the next MGB overhaul or within six months from the issue date of 

this ASB, whichever occurs first. 

c If the MRS is installed in a MGB that has not incorporated CSN 6135-10, latest 

revision and SB 61 B35-53, latest revision, annotate the log card to indicate that 

the MRS must be retired from service within ten flight hours or at the next MGB 

overhaul or within six calendar months from the issue date of this ASB, whichever 

occurs first. 

(5) Non-REL shafts in the overhaul/repair cycle which are to be utilized in REL service must 

be installed in a MGB that has been modified to comply with CSN 6135-10, latest 

revision and SB 61 B35-53, latest revision prior to entry into REL operation. 

C. MRS utilized in REL operations are to be identified as follows: 

WARNING I WARNING REL DESIGNATED COMPONENTS, WHETHER ON HELICOPTERS ENGAGED IN REL OR NON-REL OPERATIONS, ARE 

SUBJECT TO REL COMPONENT OVERHAUL INTERVALS AND 

RETIREMENT TIMES FOR THE REMAINDER OF THEIR SERVICE 

LIFE. 

TRANSITION FROM THE NON-REL TO REL CATEGORY REQUIRES 

IMMEDIATE RECLASSIFICATION TO REL AND OBSERVING REL. 

RETIREMENT TIMES AND TBO'S AS SOON AS THE TRANSITION 

OCCURS. 

NOTE: The identification letters REL indicate the components are used in Repetitive External 

Lift operations. 

(1) Using acid etch method, acid etch the identification letters REL on the Outside Diameter 

(in an area near component serial number) of the MRS flange as follows. Refer to Figure 

1. 

NOTE: Airgrit marking may be used as an alternate for acid etching. 

(2) Apply etching ink, No. 22, or equivalent, with toothpick or similar implement. Maximum 

depth shall not exceed 0.001 inch. 

(3) Neutralize surface after etch and apply oil to prevent corrosion. 

April 19/04 Page 10 
(1) Make an appropriate logbook/log card entry to show compliance with this Alert Service 

Bulletin. 

(2) Upon compliance with this Alert Service Bulletin, complete attached ALERT SERVICE 

BULLETIN COMPLIANCE RECORD CARD and return it to Sikorsky Aircraft. 

April 19/04 Page 11 
Within five days 

from the issue 

date of this ASB. 

comply with the 

following for each 

Main Rotor Shaft 

(MRS) 

Is the 

MRS Retirement Life 

currently 535 flight 

hours? 

Yes 

Proceed to Flowchart B 

Accomplishment 

Instructions 3.A. (1). 

April 19/04 

No 

Is the 

MRS Retirement Life 

currently 1,500 flight 

hours? 

Yes 

Proceed to Flowchart C 

Accomplishment 

Instructions 3.A. (2). 

No 

·Note: 

2,200 flight hours assigned 

in accordance with FAA 

AD 98-26-02 

Is the 

MRS Retirement Life 

currently 2,000 (2,200)' 

flight hours? 

Yes 

Proceed to Flowchart 0 

Accomplishment 

Instructions 3A (3). 

No 

Page 12 

Is the 

MRS Retirement Life 

currently 42,000 flight 

hours? 

Yes 

Proceed to Flowchart E 

Accomplishment 

Instructions 3.A. (4). 

TD1245 
April 19/04 

535 flight hour Main Rotor Shaft (MRS) Retirement Life. Is the MRS uninstalled or in the OverhauVRepair Cycle? Yes Annotate Log Card(s) to Retire MRS immediately. No Annotate Log Card(s) to retire MRS at 535 flight hours or next MGB overhaul or within >----- -+1 six calendar months from the issue date of the ASB, whichever occurs first. Page 13 TD1246 
Annolale Log Card(s) to indicate a new 

retirement life of t.500 flight hours or 

30.000 Lift Cycles. whichever occurs 

first. 

No Calculate the number of Lift • Note: 

Cycles accumulated by 

multiplying 30 X the number of 

Hight hours on the MRS. • 

Total accumulated number of Lift 

Cycles can be the sum of known Lift 

Cycles and calculated Lift Cycles 

April 19/04 

Annotate Log Card(s) with total 

accumulated Lift Cycles. 

No 

Continue tracking llight hours and Lift 

Cycles. Remove the MRS upon 

accumulating t ,SOO hours or 30,000 Lift 

Cycles, or next MGB overhaul or within six 

calendar months from the issue date of this 

ASB. whichever occurs first. 

No Annotate Log Card(s) to retire MRS at t ,500 

flight hours, or next MGB overt1aul or Within >------+! six calendar months from the Issue date of 

this ASB. whichever occurs first. 

Page 14 

If the MRS has 

accumulated less than 

t,SOO flight hours and has 

not accumulated 30,000 

Lift Cycles, the MRS can 

be assigned a new 

retirement life of 5,000 

flight hours or 30,000 Lift 

Cycles provided that it is 

Installed In a MGB that 

has Incorporated 

CSN 6135-10 and 

SB 6t 835·53. 

Annotate Log Card(s) to 

rebre MRS at 5,000 flight 

hours or 30,000 Lift 

Cycles, whichever occurs 

first. 

TD1247 
Annotate the Log Card(s) to indicate a 

new retirement life of 5,000 flight hours 

or 30,000 Llfl Cycles, whichever occurs 

April 19/04 

first. 

Yos 

Yes 

Annotate Log 

Card(s) to Retire 

MRS Immediately. 

Calculate the number of Lift · Note: 

Cydes accumulated by 

multiplying 30 X the number of 

flight hoors on the MRS. • 

Total accumulated number of Lift 

Cydes can be the sum of known Ufl 

Cydes and calculated Lift Cydes . 

Continue tracking flight hoors and .>--------~ Lift Cycles and retire the MRS at 

5,000 flight hours or 30,000 Lift 

Cycles, whichever occurs first. 

Does the total 

number of accumulat L~t Cycles on the 

MRSexceeed 

57,0007 

Yes 

Annotate Log Card(s) to retue MRS WJ!hm the 

neXI 50 friQht hours. or next MGB overt\aul or 

within six calendar months from the issue date 

of this ASS, whichever occurs first. 

Page 15 

.. Note: 

2.200 flight hoors assigned 

in accordance with F M 

AD 98-26-02. 

Annotate Log Card(s) to retire MRS at 5 000 

flight hours or 57,000 Lift Cydes or next MGB 

overhaul, or within six calendar months from the 

issue date of this ASS, whichever occurs first. 

TD1248 
Annotate the Log Card(s) to 

Indicate a new retirement life 

or 13,000 flight hours. 

No 

AMotate Log Card(s) by substracting 

8.500 flight hours from the current 

MRS accumulated flight hours. 

No 

Perform Moving Average 

Continue tracking flight hours and Procedure every 50 flight hours. If -----~ Uft Cycles and retire the MRS at 1---~ average number of Lift Cycles 

April 19/04 

Yes 

Armot.ate Log 

Card(s) to Rebre 

MRS immediately. 

No 

13.000 hours. exceed six. perform 

Accomplishment Instruction 3.8. 

Annotate Log Card(s) to retire MRS at next 

MGB overhaul or within six calendar months 

from the Issue date of th1s ASB. whichever 

occurs first. 

Page 16 

TD1249 
Annotate MG8 and MRS Log Card(s) to 

indicate new retirement life of 5,000 flight hours 

or 30,000 Lift Cycles, whichever occurs first. 

Does the total 

Calculate the number of Lift 

Cycles accumulated by 

multiplying six X tho number of 

Hight hours on the MRS. • 

·Note: 

Total accumulated number of Lift 

Cycles can be the sum of known Lift 

Cycles and calculated Lift Cycles. 

number No Is the MRS No Within ten flight Hours modify the MG8 by 

incorporating CSN 

6135-10 and S8 

61835-53priorto 

of accumulated flight hours or 

Lift Cycles exceed 

5.000 flight hours or 

April 19/04 

30,000 Lilt Cycles? 

Yes 

Annotate Log 

Card(s) to Retire 

MRS immediately. 

installed in a MG8 modified 

by CSN 6135·10 

and S8 61 835·53? 

continued operation. 

Yes 

Continue tracking flight hours and Lift Cycles 

and retire the MRS at 5,00() flight hours or 

30,000 Lift Cycles. whichever occurs first. 

No Is the MRS No 

Yes 

Annotate Log Card(s) to retire 

MRS within ten Hight hours, or 

next MG8 overhaul or within six 

calendar months from the Issue 

date of this AS8, whichever 

occurs first. 

installed in a MG8 modified 

by CSN 6135-1 0 

and S8 61835-53? 

No 

Annotate Log Card(s) to 

retire MRS within ton 

flight hours, or next MG 

overhaul or within six 

calendar months from 

the issue date of this 

AS8, whichever occurs 

first. 

Annotate Log Card(s) to 

retire MRS upon 

accumulating 5,000 flight 

hours or 57,000 Lift 

Cycles or next MG8 

overhaul, or within six 

calendar months from the 

issue date of this AS8, 

whichever occurs first. 

Annotate Log Card(s) to retire MRS within 50 flight hours, or 

next MG8 overhaul or within six calendar months from the 

•ssue date of this AS8, Whichever occurs first. 

Page 17 

TD1250 
April 19/04 

...1 w a: - 

D MAIN ROTOR SHAFT FIGURE 1. Page 18 101256 ... 
(

) 

ATTENTION: DIRECTOR 

COMMERCIAL CUSTOMER SERVICE 

'1111111111111111111, 

' ~ IMPORTANT NOTICE ~ , 

Upon COMPLIANCE with the attached ASB. Sikorsk-y requests your cooperation in 

completing and returning by mail or FAX this ENTIRE PAGE. , 

' ' Please fill in the requested information at the bottom of the page, so we may maintain proper , records documenting the configuration of your aircraft. This information is useful when determining configuration and effectivity of issues affecting fielded aircraft. This request is in keeping with our policy to assure that our customers receive the latest 

' 

information applicable for the maintenance of your aircraft. Thank you. 

ALERT SERVICE BULLETIN: No 61835-69 Compliance Record Card 

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' TITLE: _...:R..:.:::..T.:..:O:::.:R..:.:=--..:.M:.::a::.:.:in~G::.:::e;.:::.a:....r .:B.:::;ox:.:__- ..:.:M:.:.::a:.:.:..:....:..:R~:::::.:..r S:.:..:h::aft~-..::E:.::s.:.::ta:.:::b:.::lis::.:..:h~m:::::e~nt:....o::::.:f~N:..:;e:::.:w:.:__ ____ , 

' 

Retirement Time for Main Rotor Shafts (MRS) used in Repetitive 

__ E_x_te_r_na_I_L_ift___:_(R_E_L..:..)_a_n_d_N_o_n_-R_e..:..p_et_it_iv_e_E_x_te_rn_a_I_L_ift__:_(N_o_n_-R_E_L.:...) -------, 

OWNER/O~waR: __________________ _ 

SUBMITTED BY:. 

___________ 

DATE ______ _ 

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' FOLLOWING SERIAL NUMBERS ARE NOT AFFECTED BY THIS ASB 

' ASB HAS BEEN COMPLIED WITH ON THE FOLLOWING SERIAL NUMBERS , 

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' I I I 

________ 

I I I I I 

(Fold Up 

I 

to Arrows) 

I II IIIII' 

SA 7673-2 Rev B 
POSTAGE WILL BE PAID BY ADDRESSEE 

SIKORSKY AIRCRAFT CORPORATION 

P.O. BOX 9729 

6900 MAIN STREET 

STRATFORD, CONNECTICUT 06615-9129 U.S.A. 

ATTENTION: DIRECTOR 

COMMERCIAL CUSTOMER SERVICE 

WORLDWIDE CUSTOMER SERVICE 

Please complete the form on the reverse side and FAX to 

FACSIMILENUMBER(860) 998-7556 

or fold and return ENTIRE form to Sikorsky Aircraft Corporation