MD Helicopters Safer. Quiter. Smoother.

Service Bulletins for Model 369H Series

Page Last Updated: 21 November 2011

Size

369H
SB369H-
or HN-

Title

Issue/Reissue Date

96K 252 TAIL ROTOR BLADE ASSEMBLY INSPECTION 21 NOV 2011
93K 251 REPLACEMENT OF MOBIL SHC 626 WITH MOBIL AGL 20 JUL 2011
74K 250 Kamatics Shaft And Coupling Overhaul Program 22 DEC 2010
121K 248R1 Oil Cooler Belt, One Time Inspection 16 MAR 2009
99K 247 Tail Rotor Blade Assembly, One Time Inspection
(Ref. AD-2007-09-51) fr
26 APR 2007
51K 246R1 Tail Rotor Blade Abrasion Strip Tap Test and Modification 23 JAN 2006
71K 245R2 Main Rotor Blade Assembly Torque Event Inspection (Ref. AD2005-21-02) 04 FEB 2004
99K 244 Landing Gear Strut Inspection and Fairing Modification
(Ref. AD 2007-12-23) fr
07 APR 2000
1146K

243R3

M/R Blade Root End Inspection and Termination Action for Suspect M/R Blades (Ref. AD98-15-26)

13 JUL 1998

-

242

M/R Blade Root End Inspection
* Superceded by HN-243R3, 13 July 1998

SUPERSEDED

71K

241R1

T/R Blade, Leading Edge Inspection for Cracks

03 MAY 1999

49K

240

Input Shaft Coupling Assembly Inspection
(Ref. AD 99-04-12)

26 SEP 1997

1139K

239

Main Rotor Blade Root End Inspection (Ref. AD96-10-09)

27 OCT 1995

67K

238

Tail Rotor Blade Abrasion Strip Modification

26 OCT 1994

107K

237

Firewall Fuel Fitting Modification

26 SEP 1994

72K

236

Four-Way Trim Switch Replacement

10 MAR 1994

146K

235

One-time Inspection/Rework of Engine Air Inlet Area

20 MAR 1992

85K

234.1

Inspection/Rework of Fuel Vent System (Helicopters Equipped With 369H8108, 369H8108-501 or 369H8108-503 Fuel Vent Line Emergency Shutoff Valve)

10 SEP 1992

47K

233

Inspection of Overrunning Clutch Outer Race - 3695352 Overrunning Clutch Assy.

17 JAN1992

95K

232

One-Time Addition of Rivets to Tail Rotor Abrasion Strip

27 SEP 1991

76K

231

One-Time Rework of Main Transmission Oil Cooling Fan Mounting Bracket

01 FEB 1991

100K

230.1

Pre-flight Check and One-Time Inspection of tail Rotor Blades

01 MAR 1991

53K

229

One-Time Reinstallation of 369A1602 Tail Rotor Fork Bolt

21 NOV 1990

53K

228

One-Time Inspection of 369H8407 Engine Bleed Air Tube Flexible Area

21 NOV 1990

73K 227R1 Inspection of Lead-Lag Link Attach Nuts 06 JUL 2009
65K

226.1

One-Time Installation of 369D24054-3 Warning Decals in the Engine Compartment

04 SEP 1990

50K

225.1

One-Time Torque Check and Inspection of Main Rotor Blades

15 MAY 1991

74K

224

One-Time Replacement to Tail Rotor Blade Pitch Arm Bolt Attaching Nuts

15 JUN 1990

73K

223

One-Time Replacement of Polycarbonate Cover Assemblies (369A9817)

15 JUN 1990

57K

222

Conversion to 369A5350-41 Overrunning Clutch Sub-Assemblies

04 MAY 1990

53K

221

Installation of Oil Flow Restricting Devices into the Engine Oil and Torque Pressure Sensing System

27 OCT 1989

69K

220

One-Time Inspection of 369A5358 Lockwasher in the Overrunning Clutch Assembly and Inspection of Engine Output Drive Splines

27 OCT 1989

36K

219

Finite Service Life Reduction of the Tail Rotor Tension Torsion Strap Pack Assembly PN 369A1706 (Basic)

20 JUN 1989

49K

218

One-Time Inspection of Aeroquip Hoses (PN’s 369A8352, 369H8306, 369H8025, 369H8024-5 and 369D28651)

12 JUN 1989

122K

217.1

One-Time Inspection and Rework of Main and Tail Rotor Control Tubes (PN’s 369A7007, 369A7009, 369A7011, and 369A7012)

21 JUL 1989

44K

216

One-Time Inspection of the Transmission Driveshaft Couplings - 369H5660

05 APR 1989

62K

215.2

Inspection of 369A5352 Outer Race of Overrunning Clutch Assembly PN 369A5350

11 APR 1997

153K

214

Main Rotor Hub Strap Pack Lamination Inspection and Tri-Flow Wash Procedure

15 JAN 1988

72K

213

Replacement of 369A8442-Basic Latch Assembly on the Particle Separator Door

18 DEC 1987

81K

212.2

Inspection and Replacement of Tail Rotor Fork Bolt (369A1602)

21 APR 1989

107K

211.6

Inspection of Main Rotor Blade Root Fitting Assemblies - Inspection of Main Rotor Hub Lead-Lag Link Assemblies (Ref. AD95-03-13) against earlier SB date

03 JAN 2000

96K

210

Start Pump Wire Routing and Fuel Quantity Sender Inspection

15 SEP 1987

76K

209

3659A8010 Engine Oil Pressure and Torque Tube Pull Test

15 SEP 1987

52K

208.1

Daily Pre-flight Examination of Main Rotor Blade Leading Edge Abrasion Strip Bonding

10 SEP 1992

30K

207

Tail Rotor Elastomeric Bearing Shimming Procedure (Cancelled)

CANCELLED
22 FEB 2000

122K

206.1

Tail Rotor Driveshaft Aft Fail Safe Device - Installation/inspection

28 NOV 1986

233K

205

United Instrument Inc. Altimeter - Inspection/Rework

20 MAY 1986

-

204

Main Rotor Hub Strap Pack Inspection
* Superceded by HN-214, 15 January 1988

CANCELLED

124K

202

EON Seat Belt Removal

15 MAY 1986

246K

201

Exit Warning Decal (Including AC 91-32 Safety In and Around Helicopters)

07 AUG 1985

40K

200

Non - Airworthy Parts

18 MAR1985

79K

199.1

Riveting Tail Rotor Tip Cap to Blade

01 MAY 1985

529K

198.1

Corrosion Removal - Main Rotor Drive Shaft ID

30 OCT 1987

578K

197.2

One-Time Inspection of Tail Rotor Blade Leading Edge Abrasion Strip Bonding Pilot’s Preflight Check of Tail Rotor Blade Leading Edge Abrasion Strip

23 MAR1987

1170K

196

Inspection - Landing Gear Feet and Strut

01 OCT 1984

66K

195

Riveting Tip Cap to Tail Rotor Blade

27 AUG 1984

-

194

Oil Pressure and Torque Pressure Fire-Wall Fitting Check
* Superceded by HN-209, 15 September 1987

CANCELLED

93K

193

Fuel Shut-Off Valve Control Cable PN 369A8137-503 and -603 Pull Test

10 APR 1984

1024K

192

Instrument Cluster 4-Pack Conversion AC to Rochester

15 FEB1984

1144K

191

Main Rotor Swashplate Bearing Inspection and Possible Replacement

23 DEC 1983

43K

190

Battery Case Inspection

28 OCT 1983

52K

189.1

Inspection and Overhaul of Fuel Shutoff Valve (PN 369A8104-5)

20 AUG 1984

73K

187.1

Installation of Collective Stick Support Bracket Reinforcement Strap

23 NOV 1983

43K

186

Fuel Vent System Hose Inspection

02 MAY 1983

96K

185

Fuel System Service, Maintenance and Testing

15 MAR 1983

41K

184

Center Passenger Seat, Lap Belt Check; Preflight Check of Passenger Lap Belt and Shoulder Strap Fit and Adjustment

15 FEB 1983

101K

183

Relocation of Engine Air Inlet Filter Bypass Door Aft Pulley PN 369A8448 and Bracket PN 369A8447, and Particle Separator Filter PN 369H90152-3 Gasket Inspection

10 JAN 1983

158K

182

Replacement of Float Inflation System Solenoid Valves With Squib Valves PN 369H90121 Series Emergency Float Assemblies

10 JAN 1983

77K

181

New Shimming Procedure for Tail Rotor Drive Shaft Forward Flexible Coupling PN 369A5501 or 369H92564, With Fail Safe Device Installed

12 OCT 1982

61K

179

Replacement of Intercom (ICS) Switch and Jack Assembly

01 JUL 1982

105K

177

Instrument Cluster 3-Pack Conversion - AC to Rochester

15 FEB 1982

77K

175

Inspection of PN 369A1200 Series Main Rotor Hub Assembly; Inspection of PN 369A1220 Main Rotor Blade Lead-Lag Pivot Bolt (Vertical Hinge Pin)

04 JAN 1982

71K

174

Main Rotor Brake System PN 369H90123 Series - Installation of Master Cylinder stop PN 369D292585

28 AUG 1981

86K

173

Deactivation of Main Rotor Brake System (if installed); Periodic Inspection of Tail Rotor Drive Shaft Forward Flexible Coupling PN 369A5501 or 369H92564. Installation of Fail Safe Device at Tail Rotor Drive Shaft Forward Flexible Coupling PN 369A5501 or 369H92564 Check of Flexible Couplings.

02 NOV 1981

58K

172

Inspection and Torque Requirements for Scroll Mounted Bleed Air Fittings

21 JUL 1981

304K

171

Inspection/Modification of Breeze Corporation Inc. Hoist PN BI-16600-12

18 JUN 1981

95K

170

Corrosion Inspection/Treatment One-Way Lock Support Assembly PN 369A7314 and 369N2648

04 JUN 1981

80K

169

Replacement of PN 369A7706-3 RPM Governor Lever Control Rod

15 MAY 1981

95K

168

Special Inspection of PN 369A7003-1 Swashplate Bearing Assembly

06 MAY 1981

82K

167

Shimming Procedure for Gas Producer Interconnecting Torque Tube Assembly

04 MAY 1981

197K

165

Field Inspection and Repair of Tail Rotor Transmission Main Housing Assembly PN 369A5401

15 APR 1981

134K

164.1

Inspection of Overrunning Clutch Sprag Assembly

10 MAY 1983

70K

163

Sealing of Interface of Abrasion Strip and Main Rotor Blade Skin

30 JAN 1981

72K

162.1

Inspection of PN 369A7003-3 Swashplate Bearing

14 SEP 1981

64K

158

Wiring Modification - Untility Light Circuit and Transmission Oil Pressure and Temperature Warning Light Circuit

30 SEP 1980

119K

156

Identification and Possible Rework of Seat Belt and Shoulder Harness Assemblies

11 JUL 1980

98K

155

Polarity Check of Diode Assemblies

30 JUN 1980

58K

152

Removal of Filter Gasket - Engine Air Inlet (Particle Separator) Filter Kit Installation PN 369H90148 and 369H90148-501

03 MAR 1980

68K

150

PN 369A1800 Series and PN 369H1800 Tail Rotor Pitch Control Assembly - Seating of Bearing Inner Race; Torque Increase for PN 369A1817 Locknut

26 NOV 1979

838K

146

Inspection - Collective Torque Tube Support Bracket (PN 369A7304 Magnesium, PN 369H2608 Aluminum) and Collective Bungee Support Bracket (PN 369A7339 Magnesium, PN 369N2650 Aluminum)

01 AUG 1979

1344K

145.2

100 Hour Periodic Inspection Fuel Tank Sending Unit and Fuel Low Warning Light Indication System

04 MAY 1981

1532K

144

Kit Installation, PN 369D290140 - Auxiliary Fairing and Seals Air Filter (Particle Separator)

23 JUL 1979

1130K

140

Inspection of Main Rotor Blade Root Fitting Assemblies, Inspection of Main Rotor Hub Lead-Lag Assemblies

05 SEP 1979

1209K

139

Inspection and Repair - Tail Control Station 142.00 Bellcrank Support, PN 369A3035-11 and 369A3035-15

11 JUN 1979

103K

136

Field Rigging Check - PN 369A8013 Series and PN 369A8051 Series Heater Control Valve Assembly

16 FEB 1979

113K

131.1

Replacement of PN 369A1602 Tail Rotor Drive Fork Hinge Bolt and PN 369A1603 Nut, New Assembly Procedure for Tail Rotor Hub and Drive Fork Unit, Periodic Check of Flapping Bolt Preload

02 SEP 1980

40K

130

Periodic Inspection - Battery Over-Temperature Warning System

10 JAN 1979

68K

128.1

Inspection and Rework of Tail Rotor Hub PN 369A1725-Basic and 369A1725-5

08 DEC 1978

50K

124

Engine Compressor Water Wash Kit Installation PN 369A92537 - Inspection and Replacement of Rivets

14 APR 1978

47K

121

Inspection - PN 369H90085 Litter Door Installation

30 NOV 1977

82K

118.2

Overrunning Clutch Assembly PN 369A5350-601 - Inspection of PN 3695350-11 Clutch Assembly; PN 369A5361 Ball Bearing, and PN 369A5368 Seal

27 OCT 1978

58K

117

Inspection and Modification of Oil Cooler Duct PN 369H8301 or 710108 Kit Installation PN M50451

22 JUL 1977

75K

116

Wiring Modification Kit (PN M50450) Automatic Engine Re-ignition Kit PN 369H90118-505, -507, -509, -511

08 AUG 1977

117K

114

Replacement of Tavco PN 23111357 Solenoid Valve, Float Inflation System - Emergency Float Assemblies Hughes PN 369H92036-1/-2

15 APR 1977

76K

111.1

Inspection of PN 369A3511-15 and 369A3511-17 - Tailboom Bracket Assemblies, Tail Rotor Transmission Attachment

12 SEP 1977

57K

110

Inspection - Tail Rotor Drive Shaft Damper PN 369A5506

24 DEC 1976

62K

109

100 Hour Inspection - Main Rotor Hub Lead-Lag Links, PN 369A1234-Basic, -7, 80-369H1234, and Lead-Lag Link Assembly PN 369H1203

24 DEC 1976

42K

108

Inspection - Attachment Hardware, Main Rotor Pitch Control Rods to Pitch Housing Assembly

24 DEC 1976

64K

103.2

Rework of PN 369A7120 - Longitudinal Friction Guide Link, Cyclic Pitch Control Installation

12 SEP 1977

78K

102.3

Inspection of PN 369A2001-601 - Shock-Mounted Stabilizer Strut Assembly and Possible Replacement of 369A2130 Damper Plunger

24 DEC 1976

45K

101

Field Replacement of Lock Fitting - Ground Handling Wheel Assemblies PN 369A9905 (AER-BEA PN AB 2387)

10 AUG 1976

43K

99

Inspection - Tail Rotor Pitch Control Link Assemblies PN 369A1807-Basic and -5

18 JUN 1976

54K

98

Potting of N2 Governor Control PN 369A4580 - Pilot’s and Co-pilot’s Collective Pitch Stick Assemblies

18 JUN 1976

53K

97

Relocation - Outside Air Temperature (OAT) Indicator PN 369H4515 (Modification Kit PN M30301)

18 JUN 1976

52K

96

Engine Air Particle Separator Filter Assembly Kit Installation PN 369H90148 Basic and -501 Configurations - Installation of New Aft Screen Assembly PN 369H90157

10 MAY 1976

56K

95

Inspection and Repair - Adjustable Upper Engine Mount Assemblies PN 369H8016-1 and -2

26 APR 1976

1144K

91

Modification for Seating and Belts for (4) Kit Installation, PN 369H90035-501 Additional of Head and Back Restraint Panels (FAA AD 75-09-17)

23 JAN 1976

2282K

88

Inspection - Fiberglass Tail Rotor Blades PN 369A1710-Basic, -9, -11 369A6120, 369A1607 and 369CSK22 (FAA AD 75-22-04)

28 AUG 1975

949K

87

Inspection and Relocation of Fuel Filter Pressure Switch PN 369H8144

23 JUN 1975

1185K

86

Tail Rotor Drive System Inspection - Installation of Tail Rotor Drive Shaft PN 369A5518-601 and Bungee Assembly Associated With Metal Tail Rotor Blades and Indexing of all Helicopter Tail Rotor Drive Shafts

28 APR 1975

1594K

83

Inspection - Root Fitting of Metal Tail Rotor Blades PN 369A1613-Basic and -3 (FAA AD 75-10-04)

15 APR 1975

1231K

82.1

Inspection/Repair, Aft Fuselage Skin Cracks

26 SEP 1975

1229K

79.1

Re-greasing Double Row Bearing - Main Rotor Swashplate Bearing Assembly PN 369A7003-3

24 SEP 1982

1016K

75

Rework or Replacement - Fuel Cell Assemblies PN 369H8101-3, -5 and 369A8102-3, -5

19 AUG 1974

846K

74.2

Installation of Aluminum Type Main Rotor Blade Pendulum Weight Vibration Absorber Assembly PN 369N2697

29 SEP 1975

1020K

73

Inspection - Main Rotor Blade Trailing Edge (FAA AD 74-20-04)

19 AUG 1974

1144K

68

Terminal - Inspection/Modification - Nickel-Cadmium Battery PN 369A4530 and 369H4540

15 APR 1974

969K

66

Inspection of PN 369A2515-3 Frame and Battery

25 MAR 1974

884K

65

Replacement Metal Tail Rotor Blade PN 369A1613-3 - Compatibility Criteria (FAA AD 74-07-02)

04 MAR 1974

1076K

62

Installation of Nickel-Cadmium Battery Temperature Sensing Modification Kit PN M50037 or M50038

06 AUG 1973

1172K

61

Periodic Inspection - Main Transmission Ring Gear Bolts PN 369A5174 or 369A5145

31 JUL 1973

1236K

56

Main Transmission Assembly PN 369A5100 Series (Including Basic and All Dash-Numbered Configuration) - Installation of New Ring Gear Bolts and Serial Number Identification

06 MAR 1973

132K

54

Inspection - Landing Gear Damper Assembly (Poppet Type) PN 369H6340 and 369H92131

23 OCT 1972

44K

53.1

PN 369A5400 Tail Rotor Gearbox Revised Overhaul Schedule (TBO) and Component Infinite Life (Input Gearshaft Assembly) (FAA AD 72-16-9)

07 AUG 1972

47K

50

Inspection and Shimming - Cabin Heater Control Valve Assembly

31 MAY 1972

82K

48

Modification and Alignment Check - Rotor Brake Installation

01 MAY 1972

149K

47

Modification - Mechanical Release System, Cargo Hook Kit Installation PN 369H90065

10 APR 1972

60K

45

Installation - New VNE Placards

29 FEB 1972

43K

40.1

Inspection - Tail Rotor Transmission Output Bevel Gearshaft

13 DEC 1971

103K

38

New Pressure-Actuated Switch - Automatic Engine Re-ignition Kit Installations PN 369H90118-501 or PN 369H90140

23 AUG 1971

99K

37

Rework - Engine Oil Cooler Fan Assembly PN 369H8062

12 AUG 1971

108K

34.1

Modification Kit PN M50438 - Trim Potentiometer, Engine Oil Pressure Gage

16 JUN 1971

142K

28.1

Kit Installation PN M50027 - Modification, Transmission and Coupling Fan Assembly

01 MAR 1971

69K

23

Modification for Door-Off Flight-Canopy Upper Windshield Assemblies (PN 369A2405-3 & 369A2405-4)

11 SEP 1970

43K

18

Kit Installation PN M30209 - Engine Fuel Filter Pressure Switch

21 APR 1970

86K

11

PN M30223 Kit Installation Main Rotor Locknut and Retaining Ring

08 DEC 1969

100K

8

Inspection and Possible Retirement Main Rotor Blades PN 369A 1100-501 (FAA AD 70-16-7)

19 NOV 1969

48K

1.1

Inspection - Tail Rotor Transmission Assembly, PN 369A5400

27 OCT 1969

45K

1.1*

Addendem x1

27 OCT 1969

MD Explorer MD 600N MD 520N MD 530F MD 500E