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Service Letters

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No. Description A/C or Float Model Serial numbers Rev Date
1 Hyd. motor circuit breakers 6000A - Beaver MKI, MKIII  60001-60006,60011,60012    4/26/1983 
2 Main gear up-stop adjustment 6000A - Beaver MKI, MKIII  60001-60006, 60011-60014    4/26/1983 
3 Nose gear trolley-roller interconnect 6000A - Beaver MKI, MKIII  60001-60012, 60015,60016    4/26/1983 
4 Hyd. system pressure relief valve 3730, C185, C206, 6000A - Beaver MKI, MKIII  0-37614, 0-60030     
5 Center of gravity limits C206 per STC SA18GL  Thru 37614 or inst. prior to 11-29-83    11/29/1983 
6 5A3-399 bush insert in aft end of main gear slide tube 6000A - Beaver MKI, MKIII  60001-60038    8/15/1984 
7 Main gear oleo shock strut 6000A - Beaver MKI, MKIII  60001-60044    12/26/1984 
8 Link-nose gear truck to ram 6000A - Beaver MKI, MKIII  60001-60054    11/25/1985 
9 Installation of diode for protection of hyd. pressure switch 3730 - C185, C206, 6000A - Beaver MKI, MKIII  37636 & down 60050 & down     
10 Install placard, "Flammable Liquids Prohibited" 3730, C206, 6000A - Beaver MKI, MKIII  37636 & down, 60050 & down     
11 Installation of new electric hyd. pump motor 3730 - C185, C206, 6000A - Beaver MKI, MKIII, 8000A - Caravan  37652 & down, 60078 & down, 80006 & down    6/9/1987 
12 Water rudder, rivet shear 8000A - C-208 Caravan  80001 - 80006    6/23/1987 
13 Hydraulic pump motor All  All amphib floats with electric hyd. pump mounted in floats or on firewall    8/4/1987 
14 Pump out tube - plastic All  All floats with nylon plastic pump out tubes    8/13/1987 
15 Hyd. oil contamination in the landing gear hydraulics All  All amphibian floats    2/19/1988 
16 Pilot and Co-Pilot seat stop relocation Beaver MKI, MKIII  Beaver MK I & MK III with pilot and Co-Pilot seats installed per STC SA711GL    10/19/1988 
17 Installation of "Seat Locked" warning placard Beaver MKI, MKIII  Beaver MK I & MK III with pilot and Co-Pilot seats installed per STC SA711GL  1  8/30/2006 
18 Wipare STC SA1311GL (8000 lb. gross weight increase) C208 Caravan with 8000 floats  2080114 & up    10/26/1988 
19 Proper engagement of the seat locking mechanism Beaver MKI, MKIII  Beaver MK I & MK III with pilot and Co-Pilot seats installed per STC SA711GL    10/27/1988 
20 Inspection of fuselage lateral support beam 8000, Caravan  C208 Caravan with 8000 floats built before 1-1-90    1/15/1990 
21 Installation of AN hardware 4000's on C206 a/c STC SA1483GL  40003-40026     
22 Install front brace wire fitting C208 Caravan with 8000 floats  80001-80026, 80029-80034     
23 Elevator trim circuit breaker, C208 Caravan with 8000A installed C208 Caravan with King autopilot & 8000A floats installed      9/23/1991 
24 Intentionally left blank        
25 Reinforcement of Model 4000 float hull bulkheads C206 or C185 with 4000 floats  40001-40016, 40019-40022, 40025-40054, 40057-40060, 40074-75    5/1/1992 
26 Retract cylinder-main gear-3730 3730A - C185, C206      9/14/1992 
27 Reinforcement of glareshield and V-brace 4000 - C206  All    7/21/1992 
28 Nose and main gear ram update 4000, 6000, 8000  40072A & down, 60210A & down, 80048A & down    10/10/1992 
29 Install tinnermans - access covers 4000,6000,8000 floats  All    3/23/1993 
30 Install 675 SHP PT6A-114A -C208 Cessna 208 Caravan  2080001 & up    6/6/1993 
31 Firewall Modification Cessna 208 Caravan  2080001 & up    1/26/1994 
32 Install cover - wheel well 4000 Amphibs  All    3/1/1994 
33 Conversion of Model 6000 to Model 6100 Beaver MKI, MKIII  All 6000 floats installed on Beaver MK III with 6000 lb G.W.increase    9/15/1994 
34 Nose gear shimmy info 6000/6100 Amphibs  DHC 2 MK I, MK III    12/5/1996 
35 Conversion of Model 8000 hull (Cessna 208) to Model 8000 (DHC - 3) hull 8000 floats  DHC-3 Otter    1/24/1996 
36 Rear strut - aft attachment - Twin Otter DHC-6 Twin Otter Model 300 with 13000 floats  130001-130022    12/4/1996 
37 Install oil filter for float hydraulic system Cessna 208 Caravan  All    1/20/1997 
38 Revisions or additions to 2100 TSO float 2100 TSO floats  21001-21030    10/13/1997 
39 Conversion of 3730 float to 3800 float Cessna 185, 206  N/A    10/23/1997 
40 Install Model 2100 float - PA-18 Piper PA-18 with 2100 floats  N/A    11/4/1997 
41 Install nose wheel plunger 2100/2350 floats  21001,02,07,08,11-14,17-20,25,26, 31,32,35-52,55-68,71-88
23003,04,09-12 		   7/27/1998 
42 Firewall Modification - Plate Caravan 208/ with 8000 floats  20800001 and Up    4/26/1999 
43 New Wheel and Brake Assembly 3000, 3450, 6000, 8000 Floats  N/A    6/1/2000 
44 Firewall Modification - Fitting Lower Firewall Caravan 208/ with 8000 Floats  20800001 and Up    3/24/2000 
45 Modification - Main Landing Gear 3450 Floats  34001 - 34032    9/20/2000 
46 Modification - Main Landing Gear 3000 Floats  30001 - 30046    9/20/2000 
47 Installation of Hinged Access Covers to Float Top Deck 13000 Floats  Optional All 13000 Series Floats  B  7/15/2010 
48 Addition of Hydraulic Accumulator Wipline 2100, 2350, 3000 and 3450 series amphibious floats    A  3/15/2006 
49 Placard-Floatplane Airspeed Limitations PA-18 Floatplane  Float S/N 276 & Down, with 2000 lb Gross Wt Kit    9/4/2001 
50 Inspection of aircraft skin rivet head interference, on float cross wire pulls. C206  All model Cessna 206 aircraft on Wipline Model 4000 and 3450 floats.    11/6/2000 
51 Modification-Foam filled float Boosters 2100 & 2350 Floats  2100 & 2350 Floats  A  7/13/2005 
52 Modification - Main Landing Gear 2100 & 2350 Floats  2100 Floats S/N 21232 and lower, 2350 Floats S/N 21032 and lower    4/25/2002 
53 Installation - Chinese Baggage placards 8000 Floats  80211A, 80212A, 80213A, 80214A, 80227A, 80228A, 80247A, 80248A    6/3/2002 
54 Installation - Shock Strut - Metering Tube 8000 Floats  80244 and DN    6/17/2002 
55 Main Landing Gear Shock Strut Replacement 2100A, 2350A Floats  2100A S/N's 21327A, 21328A, Updated, 21344A & DN, 2350A S/N 23046A & DN    2/18/2003 
56 Main Landing Gear Shock Strut Replacement 3000A, 3450A Floats  3000A S/N 30094A & DN, 3450A S/N 34084 & DN    11/13/2002 
57 Axle - Nose Gear Trolley - Replacement 2100A, 2350A, 3000A, 3459A  2100A S/N's:21412 & DN    10/1/2003 
58 208 Seaplane Float Spreader Bars - Heavy Duty 8000 Floats  S/N 80230 & DN    10/1/2002 
59 Removal of Main Gear Tunnel for Seaplane Floats 13000S Floats  All Seaplane Floats    2/17/2003 
60 Installation of Pressure Switch Diode 3730 A Floats  All    6/16/2003 
61 Main Gear Roller Inspection / Torque Arm Replacement 3000, 3450 A Floats  30001A to 30082A, 34001A to 34066A, 30001A to 30118A, 34001A to 34128A    8/28/2003 
62 NOSE WHEEL SHIMMY WIPLINE 2100/2350 SERIES AMPHIBIOUS FLOATS  All    9/15/2003 
63 Addition of vent ball stop AT-802A Fire Boss  SN: 154,155,168,169    4/6/2004 
64 PA-18 Wide Body Cub modification for 2000lb gross weight, landplane and floatplane.   SN's AF18162 & Down - Wide Body Cubs only. Ref. STC SA02187AK    5/24/2004 
65 #7 Bulkhead 3000 - 3450  All model 3000 S/N 30133 and up. All model 3450 S/N 34159 and up.    2/3/2005 
66 Nose wheel shimmy Wipline 2100, 2350, 3000 and 3450 series amphibious floats      9/9/2004 
67 Model 2100 and 2350 weight revision. Model 2100 and 2350 floats      8/30/2004 
68 Model 3000 and 3450 weight correction. Model 3000 and 3450 floats      8/23/2004 
69 Replacement of main gear drag link bearings 2100/2350, 3000/3450  2100A: S/N 21001 thru ----- 2350A: S/N 23001 thru -----3000A: S/N 30001 thru -----3450A: S/N 34001 thru -----  C  7/20/2005 
70 Installation -- NAS bolts - Aux Fin - Stabilizer A/C with 10000 floats:  A/C S/N's: 802-0029, 0154, 0155, 0168, 0169, 0173, 0179    12/27/2004 
71 AT-802 Inspection for Cracks AT-802 aircraft with Wipaire 10000 Floats    D  4/6/2006 
72 802 Air Tractor Float Longeron and Float Bracket Repair AT-802 aircraft with Wipaire 10000 Floats    C  4/6/2006 
73 Aviat A-1 operation at A-1A Gross Weight through Aviat Service Bulletin 13 2100 floats      3/1/2005 
74 Removal of Horizontal Panel and Trunion on Seaplane Floats for Weight Reduction 13000 floats      6/8/2005 
75 Model 2100 and 2350 weight correction Model 2100 and 2350 floats    A  6/27/2005 
76 AT-802 Fireboss Finlet Inspection & Repair AT-802 w/ Fireboss conversion  all serial numbers    10/5/2005 
77 Updates for the Husky Long Flap Installation 2100 Floats  A/C S/N's: 2285, 2288, 2289, 2291 & Up  A  1/27/2006 
78 AT-802 Fire Boss brake line lengthening 10000 Amphibious Floats  AT-802 S/N 10001-10052    4/6/2006 
79 AT-802 Fire Boss Gear Position Switch Brackets 10000 Amphibious Floats  All AT-802 aircraft    4/6/2006 
80 AT-802 Fire Boss Slide Tube Corrosion 10000 Amphibious Floats  All AT-802 aircraft    4/6/2006 
81 AT-802 Adding Larger Water Rudder Stop on Aft Bulkhead 10000 Amphibious Floats  AT-802 S/N 10001-10052A    4/20/2006 
82 AT-802 Fire Boss Forward Upper Brace Supports 10000 Amphibious Floats  All AT-802 aircraft    5/31/2006 
83 AT-802 Fire Boss Shock Strut T-Seal Change 10000 Amphibious Floats  All AT-802 aircraft    6/30/2006 
84 Intentionally left blank        
85 Baggage Door Lip and Sealing 2100, 2350, 3000, 3450, 6000, 8000 Floats  All    6/30/2006 
86 Cessna 206H Drain Hole Grommets All 206 STC Applicable Float Sizes  Cessna 206H (other models optional only)    7/20/2006 
87 Inspection Cover Upgrade All 2100, 2350, 3000, 3450 Amphib and Seaplane Floats      8/30/2006 
88 Cessna 172 Heavier Drag Wire Brace Cessna 172,172XP - 2100, 2350 Floats      9/5/2006 
89 Installation Fuselage Frame Tubing Repair and Installation Revised Kicker Strut Air Tractor AT-802A - 10000 Float    B  9/25/2008 
90 Installation of Additional Filters for the Scoop Hydraulic Solenoid Valve Air Tractor AT-802A - 10000 Float      1/25/2007 
91 Installation of Modified Main Wheel Seals Air Tractor AT-802A, de Havilland DHC-6- 10000 Float, 1300 Float      1/25/2007 
92 Air Tractor Float Brackett Welding Repair, S/N 217 and Similar Air Tractor AT-802A - 10000 Float    A  3/31/2007 
93 AiT-802 Asymmetric Scoop Position Indicator Upgrade Air Tractor AT-802A - 10000 Float    A  3/22/2007 
94 Fire Boss Foam Tank Securing Air Tractor AT-802A - 10000 Float    C  8/3/2010 
95 Slide Tube End Machining Repair Cessna 208 Caravan - 8000 Amphibious Floats  8000 Amphibious Floats - 80323 & 80324    6/1/2007 
96 Caravan Under-Wing Mounted Hobbs Meter Switch Cessna 208 Caravan  Amphibious or Seaplane Floats    8/14/2007 
97 Nose and Main Gear Actuator Replacement 2100,2350,3000,3450 Amphibious Floats    B  2/10/2008 
99 T-Seal Upgrades for Main Gear Ram and Nose Actuator 6100, 8000, 10000, 13000 Amphib floats    A  4/10/2008 
100 Retrofit step-struts for a grease hole 3450, 8000, 9000 13000 Amphib. and Seaplane floats    A  6/25/2008 
101 Wipline 10000 Floats Baggage Floor Repair Wipline 10000 Floats    B  11/26/2008 
102 Lake and Air Gear Advisory Information All  Wipline Amphibious Floats  A  1-30-09 
103 Fire Boss spin-on hydraulic filter revision 10000 Amphibious Fire Boss    A  4-15-09 
106 8000 Water Rudder Pivot Shaft and Springs Inspection Single Otter, 8000 Amphibious or Seaplane Floats    A  5/30/2010 
107 Turbo Beaver AFMS change. 6100 Floats    A  6/15/2010 
108 Kodiak Top Arm Modification, 7000 Main Gear 7000 Amphibious Floats    B  10/15/2010 
109 Heavy seas strut package option 7000    A  9/9/2010 
110 Forward Strut Attach Bulkhead Fatigue Crack 10000 Amphibious Floats    A  11/3/2010 
112 Optional Hydraulic Power-Pack Timer Relay Installation 2100, 2350, 3000, and 3450 Amphibian Floats    A  1/15/2011 
114 Grease seal vent hole addition for main landing gear bearings Amphibious float models 3000A, 3450A, 6000A, and 8000A    A  2/21/2011 
119 Reposition elevator down spring attachment tab. 7000S or 7000A    A  3/30/2011 
120 Bushing repair for forward, lower center fuselage bow tie mounting plate 13000    A  4/12/2011 
121 Fuselage modification, Sta. 228, empennage/tail wheel attach bulkhead fastener replacement to facilitate inspection for AD 99-15-07 compliance Viking DHC-2 MK I Boss Beaver 6100, Ski Plane, Wheel Plane    A  8/3/2011 
122 Fuselage modification, "Jo-Bolt" installation for 5600 lb GW Beaver Viking DHC-2 Mk. I "Beaver" with Wipaire 5600 lb gwi, 6100, wheel plane and ski plane    A  8/3/2011 
123 Quest Kodiak modified axle beam bushing. Quest Kodiak 100, Wipline 7000 Floats    A  8/30/2011 
125 Bow Bulkheads, Lower Flange Reinforcement 8000  All    9/26/2011 
126 Stern Bulkheads, Lower Flange Reinforcement Fire Boss Air Tractor 802 & 802A with Wipline 10000 Floats  10118 and prior  B  12/7/2011 
128 Main Landing Gear Gravel Deflector Installation Quest Kodiak on Wipline 7000 Floats    A  11/11/2011