AC 121-1A

Change 4Historical

Advisory circular · Standard Operations Specifications - Aircraft Maintenance Handbook

Approved
July 7, 1978
Last reviewed
October 25, 2024
Cancels
AC121-1A CHG 3AC120-21AC120-24A
Family
AC 121-1 · 1 version
Revision
A, change 4
14 CFR parts
1

Guidance, not mandatory unless a rule or AD requires it. DRS record last changed November 22, 2025.

Show pages 218–229
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c. OC "On Condition" items will be maintained in continuous airworthy condition by periodic and progressive inspections and checks, services, repair and/or preventive maintenance and are appropriately described in the operator's maintenance manual.

d. Parts or sub-components not listed herein will be checked, inspected and/or overhauled at the same time limits specified for the component or accessory to which they are related.

Abbreviations used in the JetStar Model 1329 maintenance specifications are defined as follows:

PF - Indicates "Preflight Inspection" FC - Indicates "Functional Check" BC - Indicates "Bench Check" EO - Indicates "Engine Overhaul" EC - Indicates "Engine Change" OC - Indicates "On Condition" R&R - Indicates "Remove and Replace" HYD - Indicates "Hydrostatic Test" C - Indicates "Calibration" ST - Indicates "Scrap Time" DI - Indicates "Detailed Inspection" in accordance with manufacturer's methods and procedures ETI - Elapsed Time Indicated Effective date ____________________ Page 2 Of 11

OPERATIONS SPECIFICATIONS

AIRCRAFT MAINTENANCE LOCKHEED JETSTAR - MODEL 1329 Preflight Inspection/Check To be accomplished each service calendar day.

"A" Inspection/Check To be accomplished at intervals not to exceed 80 hours time in service after the preceding "B" or "C" Inspection/Check period.

"B" Inspection/Check To be accomplished at intervals not to exceed 160 hours time in service after preceding "B" or "C" Inspection/Check period.

"C" Inspection/Check

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To be accomplished at intervals not to exceed 640 hours time in service after preceding "C" Inspection/Check period.

Special Inspections The frequency and procedure for performing special inspections will be accomplished as specified in the operator's maintenance manual.

Overhaul and inspection/check period time limitations specified in hours and calendar time are maximum limits of whichever occurs first.

Effective date ____________________ Page 3 of 11

OPERATIONS SPECIFICATIONS

AIRCRAFT MAINTENANCE LOCKHEED JETSTAR - MODEL 1329

OVERHAUL INSPECTION & HOURS OR YRS. CHECK PERIOD OTHER Air-Conditioning, Chapter 21 10,000 PF A B C Actuator Emerg.

Press. 2,600/5 yrs. B C Controller Cabin Press. 2,600/5 yrs. B C Control Temperature OC B C Exchanger Heat 2,000 B C Fan Turbine Assy. 1,200 B C Indicator Cabin Air Temp. 5,000 PF A B C Indicator Cabin Rate of Climb 2,600 PF A B C Indicator Duel Altimeter/Diff.

Press. 4,000 PF A B C Oil Change, Cooling Turbine 640 B C Relay Cabin Press. 2,600/5 yrs. B C Regulator Cooling Fan Assy. 2,600/5 yrs. B C Refrigeration Assy. 3,000 B C Valve Bleed-Air Flow Control 2,600 B C Valve Shut-Off

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Flt. Station 2,600/5 yrs. B C Valve Shut-Off Emerg. Press. 2,600/5 yrs. B C Valve Shut-Off Engine Bleed 2,600/5 yrs. B C Valve Out-Flow Cabin Press. 1,200 B C Valve Needle Cabin Press. 2,600/5 yrs. B C Valve Check 5,000 B C Auto-Pilot, Chapter 22 10,000 PF A B C Accelerometer OC C Bracket Assy.

Servo Drive 2,000/2 yrs. B C Coupler Engage OC A B C Computer OC B C (B C at "C") Control Altitude 2,000/2 yrs. B C Controller 2,000/2 yrs. B C Drive Aileron Servo 2,000/2 yrs. B C Drive Elevator and Rudder Servo 2,000/2 yrs. B C Gyro Rate 2,000/2 yrs. B C Gyro Vertical 2,000/2 yrs. B C Communications, Chapter 23 10,000 PF A B C To be determined by assigned inspector.

Effective date ____________________ PAGE 4 of 11 PAGES

OPERATIONS SPECIFICATIONS

AIRCRAFT MAINTENANCE LOCKHEED JETSTAR - MODEL 1329

OVERHAUL INSPECTION & HOURS OR YRS. CHECK PERIOD OTHER Electrical Power, Chapter 24 10,000 PF A B C Battery OC PF A B C Contactor, Generator Line 4,000 B C Control Panel, Generator 2,000 PF A B C

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Generator, Starter 1,200 B C (Inspect brushes every 400 hrs.)

Inverter, Rotary 800 PF A B C Loadmeter 4,000 B C Meter Frequency 4,000 PF A B C Relay, Battery, Series OC PF A B C Relay, Inverter Input OC PF A B C Relay, Inverter Output OC PF A B C Voltmeter 4,000 PF A B C Equipment/Furnishings, Chapter 25 10,000 PF A B C Axe Fire OC PF A B C Belts, Seat OC PF A B C Galley OC PF A B C Harness, Shoulder OC PF A B C Kit, First Aid OC PF A B C Lavatory OC PF A B C Mask, Smoke OC PF A B C Raft, Life 6 mo. PF A B C Seats OC PF A B C Vest, Life 6 mo. PF A B C Fire protection, Chapter 26 10,000 PF A B C (Functional check every 2 1/2 years) Actuator Explosive OC B C (Replace every 2 years) Controller, Fire detection OC PF A B C Element Sensing OC PF A B C Extinguisher, Portable * PF B C Sphere, Fire Extinguishing * B C * Hydrostatic and life limits shall be entered here and shall not exceed those set forth in Part 173, Chapter I, Subtitle "B" of CFR Title 49.

Effective date ____________________ PAGE 5 of 11 PAGES

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OPERATIONS SPECIFICATIONS

AIRCRAFT MAINTENANCE LOCKHEED JETSTAR - MODEL 1329

OVERHAUL INSPECTION & HOURS OR YRS. CHECK PERIOD Flight Controls, Chapter 27 10,000 PF A B C Actuator Flap 6 yrs. B C Actuator Flap Screwjack 6 yrs. B C Actuator Pitch Trim 2,000 B C Booster Assy. Aileron 3,000 B C Booster Assy. Elevator 3,000 B C Compensator Mach Trim 2,000/2 yrs. B C Contactor Stabilizer Trim Normal 1,000 B C Contactor Stabilizer Trim Emerg. 2,000 B C Coupling Flapdrive, L.E. 5 yrs. B C Gear Box Flapdrive, 120 degree 6 yrs. B C Gear Box Flap 5,000 B C Motor Hydraulic Flap 5,000 B C Motor Pitch Trim Primary 1,000 B C Stop Hydraulic Flap 5,000 B C Fuel, Chapter 28 10,000 PF A B C Indicator, Fuel Quantity 2,600 PF A B C Hose, Fuel Jettison 1 yr. B C Pump, Fuel Boost Main.

P/N RR 12040B and P/N RR 12040E 300 B C P/N RR 12040D and P/N RR 12040F 1,000 B C Pump, Fuel Boost Ext. Tanks 1,200 B C Probes, Fuel Quantity OC PF A B C Valve, Motor Shutoff 5,000 B C Hydraulic Power, Chapter 29 10,000 PF A B C Accumulator 2 yrs. PF A B C Bottle Air Emerg. Lndg. Gear Ext. * PF A B C Filter, Hydraulic Line, P/N AC-2768-10 OC PF **B C P/N AC-2768-101P and P/N AC-2768-101NBP **OC/2,500 PF B C Indicator, Hydraulic Press. 5,000 PF A B C Pump, Hydraulic Electric 3,000 PF A B C Pump, Hydraulic Engine 1,200 A B C Regulator, Air Pressure 18 mo. B C Reservoir, Hydraulic OC PF A B C Valve, Engine Shutoff 5,000 B C Valve, Wing Flap Selector Standby 3 yrs. B C

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Valve, Wing Flap Selector 3 yrs. B C * Hydrostatic and life limits shall be entered here and shall not exceed those set forth in Part 173, Chapter I, Subtitle "B" of CFR Title 49.

Effective date ____________________ Page 6 of 11

OPERATIONS SPECIFICATIONS

AIRCRAFT MAINTENANCE LOCKHEED JETSTAR - MODEL 1329 @ OVERHAUL INSPECTION & HOURS OR YRS. CHECK PERIOD OTHER Hydraulic Power, Chapter 29 Cont'd.

Valve, Dual Shuttle 1,800/3 yrs. B C Valve, Speed Brake Selector, P/N 263-0046 2 yrs. B C P/N 263-0067 3 yrs. B C Valve, Thrust Reserver Selector 3 yrs. B C Valve, Air Charging/Relief 1,200 B C Valve, Check Manual Control 5 yrs.

Valve, Main Gear Door Selector 3 yrs.

Ice and Rain Protection, Chapter 30 10,000 PF A B C Motor, Windshield Wiper OC B C Valve, De-Icer Distributor 5 yrs. B C Valve, Pressure Regulator 2,500 B C Instruments, Chapter 31 10,000 PF A B C

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Accelerometer, Vertical OC B C (BC & C every 4,000 hrs.)

Clock OC PF A B C Encoder Trip/Data 2,000 PF A B C Indicator Outside Air Temp. OC PF A B C Recorder Flight Data 2,000 PF A B C Landing Gear, Chapter 32 10,000 PF A B C Actuator, Nose Gear Steering 10,000 PF A B C Actuator, Nose Gear Retract 10,000 PF A B C Actuator, Main Gear Side Brace, P/N JL/1400-9 and FL1400-11 10,000 PF A B C P/N JL/1400-7 6,000 PF A B C Anti-Skid System OC PF A B C Strut, Main Landing Gear 10,000 PF A B C Strut, Nose Landing Gear 10,000 PF A B C Tires, Landing Gear OC PF A B C Valve, Brake Selector 3 yrs. PF A B C Valve, Landing Gear Control 4 yrs. B C Valve, Nose Wheel Steering 3 yrs. B C Valve, Steering Selector 3 yrs. PF B C Valve, Brake Shuttle 1,800/3 yrs. PF A B C Wheels, Landing Gear OC PF A B C * Lights, Chapter 33 10,000 PF A B C Battery, Emergency/ Charger OC PF A B C * Magnaflux wheel tie bolts every third tire change, and dye or zyglo inner and outer wheel halves every "C"

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check.

Effective date ____________________

OPERATIONS SPECIFICATIONS

AIRCRAFT MAINTENANCE LOCKHEED JETSTAR - MODEL 1329

OVERHAUL INSPECTION & Lights, Chapter HOURS OR YRS. CHECK PERIOD OTHER 33 Cont'd.

Light, Anti- Collision OC PF A B C Light, Landing OC PF A B C Light, Navigation OC PF A B C Light, Taxi OC PF A B C Navigation, Chapter 34 10,000 PF A B C To be determined by assigned inspector.

Oxygen, Chapter 35 10,000 PF A B C Cylinder Assy. * A B C Pressure Reducer 18 mo. A B C Cylinder, Portable * PF A B C Mask/Regulator Passenger 2 yrs. A B C (FC at B) Mask, Crew Oxygen 2 yrs. PF A B C Panel Control Pass. Oxygen 2 yrs. A B C Regulator Crew Oxygen 2 yrs. PF A B C Valve Pass. Mask Container Door Actuator 3 yrs. A B C Valve Pass. Mask Lanyard 3 yrs. A B C (FC at B) * Hydrostatic and life limits shall be entered here and shall not exceed those set forth in Part 172, Chapter I, Subtitle "B" of CFR Title 49.

Drag Chute, Chapter 39 10,000 PF A B C Parachute Assy.

Deceleration OC B C ** Airborne Auxiliary Power,

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Chap. 49 10,000 PF A B C Auxiliary Power Unit (Solar) 2,000 ETI PF A B C Panel Control Regulator 10,000 C Starter/Generator 2,000 ETI C (Inspect brushes every 400 hrs.)

Doors, Chapter 52 10,000 PF A B C (Visual inspect. every 5000 hrs.)

Door, Entrance 10,000 PF A B C Hatch, Emergency 10,000 PF A B C Cone, Nose 10,000 PF A B C ** If not used within last three months, remove chute, aerate, dry and repack into container in accordance with applicable directions.

Effective date ____________________ Page 8 of 11

OPERATIONS SPECIFICATIONS

AIRCRAFT MAINTENANCE LOCKHEED JETSTAR - MODEL 1329

OVERHAUL INSPECTION & HOURS OR YRS. CHECK PERIOD OTHER Fuselage, Chapter 53 10,000 PF A B C (Visual inspec.

every 5,000 hrs.)

D.1. Structure 10,000 " members at connections of main frame at F.S.

410.5, 429.5,

450.4, 469.5 and 526 between floor level and W.L. 100.

D.1. Structure 10,000 "

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members at F.S.

F.S. 232 thru 277, 410, 526 to 539 R&R as required.

D.1. Structure 10,000 " members at F.S.

570, 589, and

608.

D.1. All main 10,000 " frames for distortion, corrosion and cracks.

D.1. Center 10,000 " fuselage upper and lower structure FS 257 to 270 for distortion, corrosion and cracks.

D.1. Forward 10,000 " upper and lower fuselage section F.S. 158 to 270 for distortion, corrosion, and cracks.

D.1. Aft 10,000 " fuselage upper and lower section for corrosion, distortion, and cracks.

D.1. Nose and 10,000 " equipment support structure for distortion, corrosion, and cracks.

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D.1. Window 10,000 " frames for stress bulges, cracks, and corrosion.

D.1. Engine 10,000 " nacelle mount yoke D.1. Empennage 10,000 (Visual inspec.

upper, lower every 2,500 & and center 5,000 hrs.)

vertical box structure for distortion, corrosion, and cracks.

Effective date ____________________ Page 9 of 11

OPERATIONS SPECIFICATIONS

AIRCRAFT MAINTENANCE LOCKHEED JETSTAR - MODEL 1329

OVERHAUL INSPECTION & HOURS OR YRS. CHECK PERIOD OTHER Nacelle/Pylons, Chapter 54 10,000 PF A B C EC D.1. Engine 10,000 (Visual inspec.

mount structure every 5,000 box beam and hrs.)

frames at N.S.

51.5 and 100.

D.1. Nacelle 10,000 " attach bolts and bolts and fittings.

Stabilizer, Chapter 55 10,000 PF A B C " D.1. Elevator 10,000 " Hinge Bolts D.1. Elevator 10,000 " Counterbalances D.1. Elevator 10,000 "

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Spar D.1. Elevator 10,000 " Ribs D.1. Horizontal 10,000 " Stabilizer Front Spar and Ribs D.1. Rudder 10,000 " Hinge Bolts D.1. Rudder 10,000 " Counterbalances D.1. Rudder 10,000 " Hinge Pins D.1. Rudder 10,000 " Spar D.1. Vertical 10,000 " Stabilizer Aft Hinge Pins, (Visual inspec.

Forward Center & magnaflux and Aft Scissors every 5,000 Joint Bolts hrs.)

Windows, Chapter 56 10,000 PF A B C Glass, All Wings, Chapter 57 10,000 PF A B C D.1. Wing to 10,000 (Visual inspec.

Fuselage Attach at 5,000 hrs.)

Bolts at Left and Right Attach Frames at F.S.

410 and 430 for Distortion, Corrosion, and Cracks D.1. Visually 3 yrs.

Inspect Fuel Tank Interior for Corrosion, Cracks, & Condition.

D.1. Wing 10,000 (Visual inspec.

forward, center, every 5,000 and aft spars hrs.)

for distortion, corrosion, and cracks.