Service Letter Index
Complete index of Grumman service letters from 1968 through 2003.
Service letters are advisory communications from the manufacturer covering improvements, inspections, and product support information. Unlike service bulletins, service letters are generally informational rather than mandatory — but many contain important guidance that your A&P/IA should be aware of during annual inspections.
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| Number | Title | Aircraft Affected |
|---|---|---|
| SL-1968-1 | Availability of Service Bulletins and Service Letters | |
| SL-1969-1A | Control System Improvements, Bungee/Rudder Bearing | AA1 (See List) |
| SL-1970-1 | Canopy Attach Screw Inspection | AA1-0001 thru AA1-0032 |
| SL-1970-3 | Wheel Fairing Installation | AA1 (All) |
| SL-1970-4 | Canopy Improvements | AA1 (All) |
| SL-1970-5 | Landing Gear Inspection | AA1 (All) |
| SL-1971-4 | General System Improvements | AA1, AA1A (See List) |
| SL-1971-5 | Cabin Floor Inspection/Modification | AA1, AA1A (See List) |
| SL-1971-7 | Rudder/Elevator Rib Rivnut Inspection | AA1, AA1A (See List) |
| SL-1971-8 | Defroster Outlet Improvement | AA1, AA1A (See List) |
| SL-1971-9 | Battery Box Cover Modification | AA1, AA1A (See List) |
| SL-1971-11 | Bungee Inspection | AA1, AA1A (All) |
| SL-1971-12 | Carburetor Air Valve Screw Inspection | AA1, AA1A (All) |
| SL-1971-13 | General Improvements/Relocations | AA1, AA1A, AA5 (See List) |
| SL-1972-1 | Propeller Care and Operation Limits | AA1, AA1A (All) |
| SL-1972-2 | Rudder Rigging | AA1, AA1A (All) |
| SL-1972-6 | Fuel Quantity/Quick Drain Placards | AA1A, AA1B, AA5 (See List) |
| SL-1972-8A | Canopy Trim Retrofit | AA5-0002 thru AA5-0154 |
| SL-1974-2 | Bondline Inspection Procedures | (All) |
| SL-1974-3 | Flap, Nose Strut, Torque Tube Repair | AA1, AA1A, AA1B, AA5 (See List) |
| SL-1974-4 | General Modifications/Improvements | AA1, AA1A, AA1B (See List) |
| SL-1974-5 | Sealing/Improvement/Replacement/Protection | AA5 (See List) |
| SL-1974-6 | Buss Bar/Bearing Collar Clearance | AA1B, AA5 (See List) |
| SL-1974-7 | Parking Brake Rigging | AA1, AA1A, AA1B, AA5 (All) |
| SL-1975-1 | Improved Anti-Shimmy Washer | AA1, AA1A, AA1B, AA5, AA5B (See List) |
| SL-1975-2 | Replacement Batteries/Battery Box Cover | AA1, AA1A, AA1B, AA5, AA5B (See List) |
| SL-1975-3 | Improved Front Seat Bottom | AA5, AA5B (See List) |
| SL-1975-4 | Landing Light Replacement | AA1, AA1A, AA1B, AA5 (See List) |
| SL-1975-5 | Vendor Service Publications | AA1, AA1A, AA1B, AA5, AA5B (All) |
| SL-1975-6 | Spinner Bulkhead Preload | AA5B-0001 thru AA5B-0040 |
| SL-1975-7 | Improved Fuel Level Visibility | AA1, AA1A, AA1B (All) |
| SL-1975-8 | Flap Bondline Inspection | AA5, AA5A, AA5B (See List) |
| SL-1975-9 | Spark Plug Lead Fouling | (All) |
| SL-1975-10 | Parking Brake Improvement | AA1, AA1A, AA1B, AA5, AA5A, AA5B (See List) |
| SL-1975-11 | Exhaust Stack/Cowl Clearance | AA5B-0001 thru AA5B-0192 |
| SL-1976-1 | Telex Microphone Replacement | AA1B, AA5, AA5A, AA5B (See List) |
| SL-1976-2 | Vendor Service Publications | AA1, AA1A, AA1B, AA5, AA5B (All) |
| SL-1977-1 | Engine Primer O-Ring Replacement | AA1, AA1A, AA1B, AA5, AA5A, AA5B (See List) |
| SL-1977-2 | Magneto Lead Isolation and Routing | (All) |
| SL-1977-3 | Canopy Lock Release Lever Placard | AA5, AA5A, AA5B (See List) |
| SL-1977-4 | Induction Air Filter Assembly Replacement | AA5B-0001 thru AA5B-0549 |
| SL-1978-1 | Improved Sunvisor Material | AA5A, AA5B – All Equipped |
| SL-1978-2A | AA5 Series Fuel Sump Tank Repair | AA5, AA5A, AA5B (All) |
| SL-1978-3 | New Service and Accessory Kits | AA1, AA1A, AA1B, AA5, AA5A, AA5B (See List) |
| SL-1978-4 | Narco Avionics SB ELT-10 #10 | AA1C, AA5A, AA5B (See List) |
| SL-1978-5 | Upholstery Replacement/Herculon Material | AA1B, AA5, AA5A, AA5B (See List) |
| SL-1979-2 | Carburetor Mixture Control Retainer | AA5B (All) |
| SL-1979-3 | Accelerator Pump/Economizer Rod Sealing | AA5B (See List) |
| SL-1979-4 | TCP Fuel Additive | AA1, AA1A, AA1B, AA1C, AA5, AA5A, AA5B (All) |
| SL-1980-1 | Service Kit SK-150, Autopilot Reactivation | AA5, AA5A, AA5B (All) |
| SL-1981-1 | Induction Air Filter Replacement | AA1, AA5, AA5A, AA5B (See List) |
| SL-1993-1 | Outboard Bearing Bracket Assembly | AA5, AA5A, AA5B (All) |
| SL-1993-3 | Placards | AA5B, AG5B (All) |
| SL-2002-1 | Fuel Gauge Wire Routing | AG5B 10201-10211 |
| SL-2003-3 | Outboard Wing Spar Attach Bolts | AG5B (See List) |
The Grumman Technical Library is maintained by Jeff Johnson, Grumman-Parts.com. All technical documents are provided for reference — always consult your A&P/IA and current FAA records for airworthiness decisions. All Models →