MD Helicopters Safer. Quiter. Smoother.

Service Letters for Model 369H Series

Last Updated: 06 MAY 2010

Size

369H
SL369H-
or HL-
SUBJECT

Issue/Reissue Date

65K SL369H-141 TECHNICAL PUBLICATIONS PRICE INCREASE 28 MAY 2010
41K SL369H-140 HELICOPTER OPERATION IN VOLCANIC ASH ATMOSPHERE 06 MAY 2010
32K SL369H-139 Availability of MDHI Publications in  Electronic Format 17 SEP 2003
34K SL369H-138 4-Bladed Main Rotor Hub Overhauls and Repairs 26 Feb 2002
34K SL369H-137 New Standard Warranty Statement 02 MAR 2001
33K SL369H-136R1 Availability of Federal Aviation Administration Supplemental Type Certificates for MD Helicopters 26 JUN 2000

33K

SL369H-135 Availability of Federal Aviation Administration Airworthiness Directives Affecting MD Helicopters 23 MAY 2000
52K 134 Required Inspections and Critical Inspection Areas 16 AUG 1999
32K 133 Transfer of Ownership of the Light Helicopter Line 19 FEB1999
40K 132R1 Torque Event/Retirement Index Number (TE/RIN) Explanation 15 MAY 2001
35K 131 Service Letter/Notice/Bulletin Designation 13 FEB 1998
25K 130 Engine Oil Tank Seal (Alternate/Recommended) 01 JUL 1997
32K 129 Increased Time Between Overhaul Period on OH-6A Main Rotor Hubs and 369A5400-700 Tail Rotor Transmission Utilization 25 AUG 1995
32K 128 Compensation for Complying With Tail Rotor Blade Abrasion Strip Notice 10 MAY 1995
33K 127.2 Introduction of the Use of an Alternate Drive System Lubricant 10 NOV 2000
47K 126 Antenna Location and Flight Maneuver Caution 22 MAR 1993
36K 125 Main Rotor Blade Inspection Program 27 JAN 1993
46K 124R3 MAINTENANCE AND OPERATION REQUIREMENTS FOR SAFE OPERATION OF SURPLUS 369A (OH–6A) SERIES HELICOPTERS 10 NOV 2004
34K 123.1 Policy Price of 369H8108 Fuel Vent Line Shutoff Valve 10 SEP 1992
32K 122 Main Rotor Hub Balancing 11 OCT 1991
31K 121 Observation of Main Rotor Hub Hoisting Eye Bolts 27 SEP 1991
54K 120 Availability of Skid Mounted Light Assembly Shims 01 MAY 1991
34K 119 Compliance to (Breeze-Eastern) Customer Service Bulletin CSB-120 (Warning Plate for Cargo Hooks) 15 DEC 1989
37K 118.1 Availability of Autronics Corporation Electrical Component Exchange Program 27 SEP 1991
85K 117 Federal Investigation of Central Aviation and Marine Corporation (CAMCO) 27 OCT 1989
34K 116 Availability of Wire Strike Protection System (Trademark WSPS) on all MDHC 369 Series Helicopters 15 SEP 1989
31K 115 Availability of Main Transmission Filler Cap Extension (MDHC PN 369D25112) 05 AUG 1989

-

114.1 Availability of New Configuration Main Rotor Blade Assemblies - 369D21 10 -515 (369D/E)
369D21102-501 (369F/FF), 369A1100-505 (369H Series) and 369A1100-606 (369A/OH-6A)
Superceded by HN-211.4.
CANCELLED
36K 113R3 CUSTOMER REQUESTS FOR ORIGINAL AIRCRAFT RECORDS 10 NOV 2004
35K 112.1 New MDHC Authorized Helicopter Airframe Repair Facilities 15 SEP 1989

-

111.1 Availability of 1990 Spares Price catalog and Floppy Disk

CANCELLED

32K 110 Validity of Spectrum Oil Analysis Program (S.O.A.P.) 15 JAN 1989
- 109 Availability of Spares Price List On Floppy Disk
*Superseded by HL-111.1, DL-85.1, EL-36.1. FL-29.1, Dated 01 March 1990

CANCELLED

32K 108.2 Facet Scavenge Oil Filter Kit, PN 1741050 (369H Series, 369D and 369E) and PN 1741300 (369F/FF) 21 NOV 1990
32K 107 Improved Fuel Drain Valve Assembly 01 JUL 1988
32K 106 Recommend Replacement Interval for 369H5655-3 & -5 Oil Cooler Bearing and 369H5648 Oil Cooler Belt 01 JUL 1988
32K 105 Chafe Wrapping of Stainless Steel Tube Assemblies and Allison Commercial Service Letter CSL 145, CSL 1140 and CSL 3092, Dated May 1, 1988 26 MAY 1988
30K 104 Additional Inspection Requirements of the Breeze-Eastern Rescue Hoist System 18 MAY 1988
36K 103 Availability and Distribution of Tri-Flow Lubricant/Wash 09 MAY 1988
61K 102 Addition of Identification Decal on Aircraft Exterior (Compliance to FAR 45.11 [D]) 06 MAY 1988
31K 101 Improved Strength PC Filter Housing - Allison Bulletin 04 APR 1988
59K 100 Illustrated Parts Breakdown of Ground Handling Wheel Assemblies (PN 369D26 10) 19 FEB 1988
30K 99 Unauthorized Distribution of Main Rotor Hub Overhaul Manual 15 JUN 1987
32K 98 External Scavenge Oil Filter System 01 MAY 1987
29K 97 Re-lubrication of Bearings in Storage 06 APR 1987
35K 96.1 Availability of Kamatics Corp. Kaflex Main Driveshaft (MDHC PN 369D25515) 05 AUG 1989
31K 95.3 Product Support Department Communication Links (Cancelled)  CANCELLED
23 MAY 2000
31K 94 Main Rotor Hub Overhaul Authorization 17 MAR 1986
32K 93 Explanation of MDHC Parts Serialization 15 SEP 1985
74K 92 Start Pump Wire Routing 10 JUL 1985
32K 91 Major Installations and Alterations to Your Hughes Helicopter 12 NOV 1984
90 Service Life Reduction for PN 369A1706 Tension Torsion Strap Assemblies Previously Used on U.S. Army TH-55 Trainer Helicopters 15 AUG 1984
33K 89 Unauthorized Tail Rotor Teeter Bearings 16 MAY 1984
67K 88 Surplus or Bogus 369D21100 Series Main Rotor Blades 10 FEB 1984
35K 87 New Attitude Gyro and Support Assembly 25 FEB 1983
38K 86 Handling and Shipping Gyros 01 FEB 1983
36K 85 Prevention of Water Leakage Through Canopy Geon Strips 10 JAN 1983
33K 84 Ground Testing - Engine Automatic Re-ignition and Engine Anti-Ice Fuel Filter System 22 NOV 1982
33K 83 Distribution and Shipment of HHI 269/369 Commercial and Military Publications 01 NOV 1982
47K 82 PN 369A7609 Series Main Rotor Swashplate Assembly - Time Between Overhaul (TBO) Increased to 2650 Hours 24 SEP 1982
54K 81 Lubrication of Drive End Bearing Liner in Aircraft Parts Corp. Model 150SG Starter-Generator 26 MAR 1982
33K 80 New PN 369D28237 Cushion for Tailpipe Hanger Assembly Designed for Longer Wear 01 FEB 1982
33K 78 Field Replacement of ‘0’ Ring for PN 369A8321 Oil Tank Filler Cap 02 NOV 1981
77.2 Summary of FAA Supplemental Type Certificates for all 369 Series Helicopters  (Superseded by SL369H-136) CANCELLED
32K 76 New Protective Boots for Main Rotor Hub and Tail Rotor Assemblies 01 SEP 1981
35K 75 Tail Rotor Driveshaft Flexible Coupling PN 369A5501 and 369H92564 Treatment With Molykote Metal Protector 21 AUG 1981
32K 74 Corrosion Control Manual now Available for General Distribution and Purchase 21 AUG 1981
56K 73 PN 369A1200 and 369N1200 Main Rotor Hub Assembly PN 369A5100-709 Main Rotor Transmission and PN 369A5400-701 Tail Rotor Transmission - Time Between Overhaul (TBO) Increased 30 JUN 1981
31K 72 Substitution of Wet Spline Drive Starter-Generator for Existing Dry Spline Drive Starter-Generator 13 MAR 1981
- 71.12 Annual Listing of Airworthiness Directives Affecting MDHS Helicopters (Superseded by SL369H-135) CANCELLED
34K 70 Compliance With FAA Airworthiness Directive and Hughes Mandatory (RED) Border Service Information Notices 30 SEP 1980
137K 69 Detroit Diesel Allison Commercial Service Letter CSL-1079, Re: High Pressure Fuel Filter (CECO Fuel System) 12 SEP 1980

-

68.13 Exchange Program - Major Helicopter Components (Cancelled, superceded by the Spare Parts, Publications and Component Exchange Price Catalog.)

CANCELLED

65K 67 New Seal Requirement for Overhaul of PN 369H6340 and 369H92131 Landing Gear Damper Assemblies 26 MAY 1980
35K 66 Engine Compressor Cleaning - Daily Water Rinse and Periodic Water Wash 18 APR 1980
256K 64 Operation and Maintenance Guidelines for Model 250 Series Engine Fuel System 01 AUG 1979
35K 63 Approved Igniter Assemblies and Ignition Exciter Assemblies for Hughes PN 369H90118 Series Automatic Engine Re-ignition Kit Installations 20 JUL 1979
33K 61 Particle Separator Installation and Inspection and Possible Removal of Circular Filter Screens 08 SEP 1978
34K 60 PN 369A1620 Series Tail Rotor Assembly - Elimination of Overhaul Schedule (TBO) Requirement - Interchangeability of 369A1725 Series Tail Rotor Hub Assembly 26 JUN 1978
35K 59 Reduction Gearbox, Model 250-C20 Engine - Time Between Overhaul (TBO) Requirement Eliminated 26 JUN 1978
51K 58 (INSCO) Instrument Specialties Co. Inc., Authorized Repair Stations and Official Sales and Service Facilities 22 MAY 1978
45K 57 Paint Schedules and Ordering Procedures 10 APR 1978
34K 56 Transmission, Main and Tail Rotor - Oil Change and Filter Period Extended From 150 Hours to 300 Hours 27 FEB 1978
64K 55 Unitization of Engine Air Particle Separator and Engine Compressor Water Wash Kits 14 FEB 1978
32K 54 Unlimited Service Life - PN 369A7010 One-Way Unilock and PN 369A5408 and 369A5408-3 Tail Rotor
Output Shafts
22 JUL 1977
62K 53 Replacement of PN 369A1613-3 - Metal Tail Rotor Blade Assemblies 22 JUL 1977
33K 52 Restriction of N2 Operating Speed 22 JUL 1977
55K 51 New PN 369A1100-503 - Main Rotor Blade Assembly With Leading Edge Abrasion Strip 08 AUG 1977
32K 50 New Oil Level Requirement for Initial Installation of Overrunning Clutch, PN 369A5350 Series 20 MAR 1977
846K 49 Power Turbine (N2) Rub or Lockup in 250-C20 Engine 04 FEB 1977
26K 48 Interim Restriction of N2 Operating Speed 04 FEB 1977
32K 47 Improved Engine Air Filter Assembly for Particle Separator Filter Kit 24 DEC 1976
42K 46 Periodic Inspection of Particle Separator Kit Installation; Removal of Outlet Screen During Cold Weather 24 DEC 1974
42K 45 New Main Rotor Damper Assembly PN 369A1423-501 24 DEC 1976
35K 44 Allison Model 250-C20 Series Engine - Installation of New High Pressure Fuel Filter Assembly 10 AUG 1976
41K 43 Interim Revision of HMI Appendix C Component Overhaul Manual - Tail Rotor Drive Fork and Hub Assembly Equipped With Conial Type Teeter Bearings 10 AUG 1976
55K 42 Recharging of Inflation Bottles for Emergency Floats 07 NOV 1975
58K 41 New Conical Type Teeter Bearings for Tail Rotor Assembly 11 AUG 1975
28K 40 Interchangeability of tabbed Main Rotor Blades (PN 369A1100-501) With Untabbed Main Rotor Blades
(PN 369A1100-501)
21 JUL 1975
56K 39.3 Main Transmission PN 369A5100-709 Upgraded Transmission - Factory Availability for Overhaul 26 JUL 1976
28K 38 Modification Kit Availably - Torquemeter Bleed Valve PN M50043 and Static Pressure Tube Bleed Valve
PN M50439
05 MAY 1975
57K 37 Extreme Turbine Outlet Temperature Effects on Turbines 28 AUG 1974
153K 36 Inflatable Floats - Service, Maintenance and Repair Facilities 05 AUG 1974
49K 35 Engine Inlet, Air Particle Separator Filter Installation PN 369H90148 Optional Equipment Availability 01 JUL 1974
55K 34 Discussion of Hughes Serial Numbering Method 31 MAY 1974
63K 33 Breeze BL-16600-11 Hoist Winch Assembly - Improper Cable Cutter Installation 18 FEB 1974
107K 32.1 Metal Tail Rotor Blades - Replacement for Fiberglass Tail Rotor Blade 05 NOV 1976
89K 31 Ordering Information - Pilot’s Door Assembly PN 369A2002 or 369H2025; Passenger Door Assembly
PN 369H2032 or 369H2038
12 JUL 1973
100K 30 Replacement of Boom Fairing Assemble on First Production Helicopter, SN 0001 thru 0100 12 JUL 1973
38K 29 Installation of Steel Washers - Driven Pulley; Belt-Driven Oil Cooler Blower Assembly 14 MAY 1973
50K 28 Torque Requirement for Driveshaft Coupling Retainer Bolts PN 369A5528 01 MAR 1973
108K 27 Corporate Name Change CANCELLED
107K 26.1 Special Tools for Installation of Tail Rotor Control Rod Grommets PN WSI-B-12AS 22 JUN 1973
91K 24 Cold Weather Torque Adjustment - Main Rotor Damper Assembly PN 369A1400, 369A1400-601 and -603 09 FEB 1973
178K 21.2 Installation of Surplus Military Parts or Salvaged Used Parts on Model 500 Helicopters 10 FEB 1984
130K 20 Shut Down Procedure - Allison Model 250-C20 Series Engine 26 JUN 1972
136K 19 Identification Plates - PN 369A5351 Overrunning Clutch Housing and PN 369A54350-11 Overrunning Clutch Sub-assembly 22 MAY 1972
98K 18 New Cargo Hook Plate 01 MAY 1972
215K 17 Approved Fuel for Allison Model 250 Series Engine 14 FEB 1972
221K 16 Allison Model 250 Engine - Sales and Service 07 FEB 1972
46K 15 Breeze BL-16600-11 Hoist Winch Assembly 10 JAN 1972
124K 14 Inspection of Nickel-Cadmium Batteries - FAA Airworthiness Directive Note 72-21-5 17 DEC 1971
151K 13.1 Improved Window Glass Retention for Pilot and Passenger Door Assemblies 24 MAR 1972
121K 12 Care and Feeding of Nickel-Cadmium Batteries 12 OCT 1971
141K 11 Tail Rotor Swash - Cold Weather Operation 12 OCT 1971
144K 6.1 Special Wrenches for Field Replacement of Main Rotor Pitch Bearing Studs 03 MAY 1971
886K 3.1 Bendix Avionics Equipment Repair and Service 05 NOV 1973
MD Explorer MD 600N MD 520N MD 530F MD 500E