Communications System, Chapter 23 May be determined by the assigned inspector.
Effective date ____________________ Page 2 of 15
OPERATIONS SPECIFICATIONS
AIRCRAFT MAINTENANCE SIKORSKY S-61L/N HELICOPTER Overhaul Inspection & Period Check Period Electrical Power, Chapter 24 9,000 Power System DC Battery O.C.
Relay, Battery O.C.
Regulator, Voltage (DC) 1,200 Relay, Over Volt Field Control 1,200 Generator/Motor 1,000 Relays, Reverse Current 2,000 Relay, External Power (DC) O.C.
Relay Motorizing 2,000 Transformer Rectifier 1,500 Receptacle, External Power (DC) O.C.
Support, Battery Vibration Absorber 1,000 Power System AC Generators (AC) 1,500 Brushless Type (AC) 2,500 Regulators, Voltage (AC) 1,200 Panels, Supervisory (AC) 1,200 Line Contactors, Generators (AC) 2,000 Relays, External (AC) O.C.
Relay, External Power Interlock O.C.
Contactor, Emergency Essential Bus 2,000 Inverter 1,000 Receptacle, External Power O.C.
Transformers, Power Step-Down O.C.
Test Receptacle, AC/DC O.C.
AC & DC Systems Wiring and Connections O.C.
Switches O.C.
Circuit Protectors O.C.
Relay, Inverter O.C.
Lights, Warning O.C.
Static Discharge Wicks O.C.
Relay, Inverter Transfer O.C.
Equipment and Furnishing, Chapter 25 9,000 First Aid Kits Cabin, Passenger O.C.
Cockpit O.C.
Effective date ____________________ Page 3 of 15
OPERATIONS SPECIFICATIONS
AIRCRAFT MAINTENANCE SIKORSKY S-61L/N HELICOPTER Overhaul Inspection & Period Check Period Seats - Cockpit Seat Belts O.C.
Shoulder Harnesses and Reels 9,000 Seats 9,000 Seats - Passenger Cabin Seat Belts O.C.
Seats and Attachments 9,000 Cabin Interior Upholstery O.C.
Partition, Cabin Movable O.C.
Fire Protection, Chapter 26 9,000 Fire Detection System - Engine Control Units, Fire detection O.C.
Sensing Loops and Fittings ** O.C. Functional Check Lights, Warning O.C.
Wiring and Connections O.C.
Circuit Protectors O.C.
Switches O.C.
Fire Extinguisher - Head Cabin O.C.
Cockpit O.C.
Fire Extinguisher System - Engine * Engine Change Lines and Nozzles * O.C.
Handles, Fire Control O.C.
Switch, Fire Extinguishing O.C.
Container and Valve Assembly O.C.
Wiring and Connectors O.C.
Indicator, Thermal Discharge O.C.
Supports, Fire Extinguisher
Container O.C.
* Directional Flow Check (Nitrogen or Smoke Source) ** Functional Check - Scheduled Engine Change Using Jetcal Analyzer or Per Sikorsky Maintenance Manual Effective date ____________________ Page 4 of 15
OPERATIONS SPECIFICATIONS
AIRCRAFT MAINTENANCE SIKORSKY S-61L/N HELICOPTER Overhaul Inspection & Period Check Period Fuel System, Chapter 28 9,000 Tub Section Tanks, Fuel 9,000 Fuel Lines, Fittings 9,000 Pumps, Booster 1,200 Ejectors 9,000 Fuel Filter, Airframe 9,000 Valves, Manual Shut-off 9,000 Valve, Cross-feed 9,000 Pressure Switch, Pump Failure 9,000 Vents, Fuel Tanks 9,000 Drain Sumps 9,000 Valves, Fuel Drain 9,000 Cabin Section Firewall * Valves, Fuel Shut-off 9,000 Functional Check Pressure Switches, Fuel Shut-off 9,000 Pressure Fueling System Valves, High Level Shut-off 9,000 Adapter, Fueling and Defueling 9,000 Valve, Fueling and Defueling 9,000 Float Switches, Intermediate Level Selector O.C.
Lines and Fittings, Fueling Adaptor 9,000 Electrical System Switches O.C.
Circuit Protectors O.C.
Lights, Warning O.C.
Wiring and Connections O.C.
Wiring & Conduits (Tank Cells) O.C.
Lights, Preset O.C.
* Functional Check at Engine Change Effective date ____________________ Page 5 of 15
OPERATIONS SPECIFICATIONS
AIRCRAFT MAINTENANCE SIKORSKY S-61L/N HELICOPTER Overhaul Inspection & Period Check Period Hydraulic Power, Chapter 29 9,000 Primary Servo System Reservoir O.C.
Pump 2,000 Manifold Assembly (Includes 6 Items) 2,000 Relief Valve Three-Way Solenoid Valve Filter (Pressure) Restrictors (By-Pass) Pressure Switch Snubber Check Valves O.C.
Hoses, Lines and Fittings O.C.
Switch, Servo Shut-off O.C.
Wiring and Connections O.C.
Lights, Warning O.C.
Circuit Protectors O.C.
Auxiliary Servo System Reservoir O.C.
Pump 2,000 Manifold Assembly (Includes 6 Items) 2,000 Relief Valve Three-Way Solenoid Valve Filter (Pressure) Restrictors (By-Pass) Pressure Switch Snubber Check Valves O.C.
Wiring and Connections O.C.
Switches, Stick Trim O.C.
Light, Warning O.C.
Filter, Auxiliary Servo O.C.
Ice and Rain Protectors, Chapter 30 9,000 Windshield Wiper System
Motor, Wiper O.C.
Converters O.C.
Arms and Blades, Wiper O.C.
Wiring and Connections O.C.
Switch O.C.
Effective date ____________________ Page 6 of 15
OPERATIONS SPECIFICATIONS
AIRCRAFT MAINTENANCE SIKORSKY S-61L/N HELICOPTER Overhaul Inspection & Ice and Rain Protectors, Period Check Period Chapter 30 (Cont.)
Windshield Washer System Reservoir O.C.
Surgemeter O.C.
Nozzles O.C.
Hoses, Lines and Fittings O.C.
Windshield Anti-Icing System Temperature Controller O.C.
Auto-Transformers O.C.
Windshield Panel, Electropane O.C.
Wiring and Connections O.C.
Switches O.C.
Pitot Tube Heater System Heads, Pitot Heat O.C.
Wiring and Connectors O.C.
Lights, Warning O.C.
Switches O.C.
Relays, Pitot Heater O.C.
Instruments, Chapter 31 9,000 Power Plant Instruments Indicators, Gas Generator O.C.
Indicators, Power Turbine Inlet Temp.
(Howell Instrument Co.) O.C.
Indicators, Oil Temperature O.C.
Indicators, Oil Pressure O.C.
Transmitters, Oil Pressure Indicator O.C.
Indicators, Fuel Pressure O.C.
Transmitters, Fuel Pressure Indicator O.C.
Indicators, Triple Tachometer O.C.
Indicators, Torque Meter O.C.
Transmitters, Torque Meter Indicator O.C.
Miscellaneous Instruments Indicator, Transmission Oil Pressure O.C.
Transmitter, Trans. Oil Pressure Ind. O.C.
Indicator, Trans. Oil Temperature O.C.
Indicator, Primary Hydraulic Pressure O.C.
Indicator, Auxiliary Hyd. Pressure O.C.
Transmitter, Aux. Hyd. Press. Ind. O.C.
Indicator, Free Air Temperature O.C.
Effective date ____________________ Page 7 of 15
OPERATIONS SPECIFICATIONS
AIRCRAFT MAINTENANCE SIKORSKY S-61L/N HELICOPTER Overhaul Inspection & Period Check Period Miscellaneous Instruments (Cont.)
Ammeter-Voltmeter (DC) O.C.
Volt-Ammeter (AC) O.C.
Indicators, Fuel Quantity O.C.
Tank Probes, Fuel Quantity 9,000 Control Units, Fuel Low Level O.C.
Sensors, Fuel Low Level O.C.
Wire and Connection O.C.
Lights, Low Level Warning O.C.
* Indicator, Landing Gear O.C.
Transmitter, Primary Hyd. Press.
Ind@ @ @ O.C.
Landing Gear, Chapter 32 9,000 Main Gear Installation Strut Assemblies, Shock 5,000 Wheels O.C.
Tires O.C.
Struts, Energy Absorbing 9,000 Supports 9,000 Attachment Fitting, Fuselage 9,000 Fairing O.C.
Switches, Under Frequency Lockout
Scissors O.C.
Wiring and Connections O.C.
* Hydraulic Pump and Motor Unit 2,000 * Hydraulic Reservoir 2,000 * Filters, Reservoir Panel O.C.
* Relief and Control Valves O.C.
* Plug Stat O.C.
* Mounting and Supports O.C.
* Lines and Fittings O.C.
* Drag Links Upper and Lower 5,000 * Switches O.C.
* Control Unit O.C.
* Relays, Landing Gear O.C.
* Relay, Pump Motor O.C.
* Emergency Release Control O.C.
* Shock Strut and Trunnion Assembly 5,000 * Retracting Cylinders 5,000 * Emergency Release Pin, Cables, and Pulleys O.C.
* Uplock Cylinder 5,000 * Emergency Air Bottle O.C.
@ * "N" MODEL ONLY Effective date ____________________ Page 8 of 15
OPERATIONS SPECIFICATIONS
AIRCRAFT MAINTENANCE SIKORSKY S-61L/N HELICOPTER Overhaul Inspection & Period Check Period Tail Gear Installation Shock Strut Installation 5,000 Centering Cylinder 5,000 Attachment, Fuselage 9,000 Wheel O.C.
Tire O.C.
Control System, Tail Wheel Lock O.C.
Fairing O.C.
Wheel Brake System Brake Assemblies O.C.
Master Cylinders 9,000 Mixing Valves, Wheel Brake 9,000 Parking Brake Valve 9,000 Hoses, Lines, Check Valves and Fittings O.C.
Lights, Chapter 33 9,000
Light Assemblies Position O.C.
Light Assemblies, Anti-Collision O.C.
Light Assemblies, Retractable Landing O.C.
Spot Lights, Cockpit O.C.
Dome Light, Cockpit O.C.
Rheostat, Emergency O.C.
Light Assemblies, Instruments O.C.
Rheostats O.C.
Light, Master Warning O.C.
Panel Assemblies, Warning Light O.C.
Control Unit, Warning Light Dimming O.C.
Dome Lights, Cabin O.C.
Reading Lights, Passenger O.C.
Lights, Cabin Emergency O.C.
Lights, No Smoking O.C.
Lights, Fasten Seat Belts O.C.
Light Assemblies, Loading O.C.
Relay, Loading Light O.C.
Lights, Warning O.C.
Wiring and Connections O.C.
Switches O.C.
Riding Light O.C.
* "N" MODEL ONLY Effective date ____________________ Page 9 of 15
OPERATIONS SPECIFICATIONS
AIRCRAFT MAINTENANCE SIKORSKY S-61L/N HELICOPTER Overhaul Inspection & Period Check Period Navigation, Chapter 34 9,000 Flight and Navigation Instruments Clocks (Wakeman) O.C.
Indicators, Turn and Slip (Allen) O.C.
Instantaneous Vert. Speed Indicator (IVIS) (Specialties Corp.) O.C.
Indicators, Altimeter (Kollsman) O.C.
Indicators, Airspeed (Kollsman) O.C.
Compass, Magnetic (U.S. Gage) O.C.
Compass, C-4A or C-14A Gyrosyn System Amplifier, Gyrosyn Compass O.C.
Flux Valve and Compensator Assembly O.C.
Control Unit, Gyrosyn Compass O.C.
Relay, Interlock (DC) O.C.
Relay, Interlock (AC) O.C.
Transformer, Power Adapter O.C.
Gyro and Sync Assembly O.C.
Servo Amplifier O.C.
Annunciator O.C.
Vertical Gyro Installation Indicator, Navigational Lear Model 4005A 2,500 Gyros, Roll & Pitch Lear Model 7000B 1,500 Amplifier Navig. Instrument Lear Model 5510B O.C.
Power Adapter Airframe Supplies O.C.
Wiring Connections O.C.
Static & Pitot Systems Lines and Fittings O.C.
Pitot-Static Mast MGB OVHL Doors, Chapter 52 * 9,000 Cabin Passenger Doors 9,000 Release, Mechanisms Door Emergency 9,000 Cargo Door 9,000 Release Mechanism, Cargo Door 9,000 Lights, Warning, Cargo and Passenger O.C.
* May be accomplished progressively by zones.
(see zone table on page 12 of 15) Effective date ____________________ Page 10 of 15
OPERATIONS SPECIFICATIONS
AIRCRAFT MAINTENANCE SIKORSKY S-61L/N HELICOPTER Overhaul Inspection & Period Check Period Doors, Chapter 52 (Cont.) 9,000 Hull Baggage Doors ** 9,000 Electronic Compartment Door 9,000 Lights, Warning, Baggage & Electronic Door O.C.
Upper Fuselage Platforms, Engine Servicing O.C.
Platforms, Transmission Servicing O.C.
Electrical Systems Wiring & Connections, Warning Lights O.C.
Switches, Warning Light O.C.
Fuselage, Chapter 53 * 9,000 Structure, Pylon (Zone 1) 9,000 Structure, Upper Fuselage Engine Compartment (Zone 2) 9,000 Structure, Upper Fuselage, Main Gear Box Compartment (Zone 3) 9,000 Support, Main Gear Box (Zone 3) 9,000 Structure, Tail Cone (Zone 4) 9,000 Hull Structure (Zone 6) 9,000 Structure, Cockpit (Zone 7) 9,000 Structure, Electronics Compartment (Zone 7) 9,000 Structure, Cabin (Zone 8) 9,000 Structure, Hull (Zone 9) 9,000 Sponsons 9,000 Stabilizers, Chapter 55 * 9,000 Stabilizer Installation (Zone 1) Structure, Stabilizer 9,000 Attachment Fittings, Stabilizer 9,000 Support, Tube, Stabilizer 9,000 Windows, Chapter 56 * 9,000 Cockpit Emergency Escape Exits 9,000 Release Mechanism, Emergency (Airframe) 9,000 Windshields and Windows O.C.
** S-61 L Model Only * May be accomplished progressively by zones.
(see zone table on page 12 of 15) Effective date ____________________ Page 11 of 15
OPERATIONS SPECIFICATIONS
AIRCRAFT MAINTENANCE SIKORSKY S-61L/N HELICOPTER
Overhaul Inspection & Period Check Period Windows, Chapter 56 (Cont.) 9,000 Cabin Windows * O.C.
Emergency Escape Exits 9,000 Release Mechanism, Emergency (Airframe) 9,000 Rotor System, Chapter 65 9,000 Main Rotor Head Installation Blades O.C.
Main Rotor Head Assembly 1,250 Azimuth Control Star Assembly 1,250 Dampers 1,250 Bifilar Vibration Assembly Main Rotor Head O/H Tail Rotor Installation Blades O.C.
Hub Assembly 1,250 Flight Controls Collective Pitch Assembly (Zone 7) 9,000 Collective Pitch Assembly (Zone 8) 9,000 Collective Balance Spring (Zone 7) 9,000 Cyclic Pitch Assembly (Zone 3) MGB O/H Cyclic Pitch Assembly (Zone 7) 9,000 Cyclic Pitch Assembly (Zone 8) 9,000 Rudder Flight Control Assembly (Zone 7) 9,000 Mixing Unit 9,000 Force Link Assembly 9,000 Rudder Flight Control Assembly (Zone 1) 9,000 Rudder Flight Control Assembly (Zone 4) 9,000 Rudder Flight Control Assembly (Zone 8) 9,000 Rudder Pedal Adjusting Installation (Zone 7) 9,000 Negative Force Gradient Spring Assembly 9,000 Primary Servos 1,250 Auxiliary Servo with Beeper Trim Valves 1,250 Rudder Control Cables O.C.
Drive Shafts Tail Drive Shaft, Section I 2,500 Tail Drive Shaft, Section II 2,500
Tail Drive Shaft, Section III 2,500 Tail Drive Shaft, Section IV 2,500 Tail Drive Shaft, Section V 3,000 Support, Tail Drive Shaft Bearings 2,500 * May be accomplished progressively by zones.
(see zone table on page 12 of 15) Effective date ____________________ Page 12 of 15
OPERATIONS SPECIFICATIONS
AIRCRAFT MAINTENANCE SIKORSKY S-61L/N HELICOPTER Overhaul Inspection & Period Check Period Rotor System, Chapter 65 (Cont.) 9,000 Gear Boxes Main Gear Box 1,250 Intermediate Gear Box 3,000 Tail Gear Box Installation 3,000 Oil Cooler Installation, Main Gear Box MGB O/H Supports, Oil Cooler Installation O.C.
Actuator, Rotor Brake Installation MGB O/H Accumulator, Rotor Brake 9,000 Relief Valve, Rotor Brake O.C.
Pressure Switch, Rotor Brake Warning Light O.C.
Master Cylinder, Rotor Brake 9,000 Lines & Fittings, Rotor Brake Hydraulic O.C.
Pressure Switch, MGB Oil Warning MGB O/H Lights, Warning O.C.
Wiring and Connections O.C.
Speed Switch, Motor/Generator (if installed) MGB O/H Note: Zones and areas referenced are as follows:
ZONE AREA
1. . . . . . . . Pylon and Stabilizer - Station 622 Aft
2. . . . . . . . Upper Fuselage, Engine Section - Station 178
- 247
3. . . . . . . . Upper Fuselage, Main Gear Box - Station 247
- 362
4. . . . . . . . Tail Cone - Station 493 - 622
5. . . . . . . . Landing Gear (Main and Tail Gear)