Float Service Letters

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Floats Service Letters

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No. Description A/C or Float Model Serial numbers Rev Date
1 Hydraulic Motor Circuit Breaker 6000A - Beaver MKI, MKIII  60001-60006,60011,60012    04/26/1983 
2 Main Gear Up-Stop Adjustment 6000A - Beaver MKI, MKIII   60001-60006, 60011-60014     4/26/1983  
3 Nose Gear Trolley-Roller Interference 6000A - Beaver MKI, MKIII  60001-60012, 60015,60016    4/26/1983 
4 Hydraulic 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 Bushing 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 & 8000A Floats  60001 thru 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    06/09/1987 
12 Water Rudder Repair 8000, 8750, 10000, 7000, 6000, 6100  87078 & down, 10144 & down  01/02/2015 
13 Hydraulic pump motor All  All amphib floats with electric hyd. pump mounted in floats or on firewall    08/04/1987 
14 Pump out tube – plastic All  All floats with nylon plastic pump out tubes    08/13/1987 
15 Hyd. oil contamination in the landing gear hydraulics All  All amphibian floats    02/19/1988 
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  08/60/2006 
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    01/15/1990 
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      09/23/1991 
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    05/01/1992 
26 Retract cylinder-main gear-3730 3730A - C185, C206    09/16/2016 
27 Reinforcement of glareshield and V-brace 4000 - C206  All    07/21/1992 
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    03/23/1993 
30 Install 675 SHP PT6A-114A -C208 Cessna 208 Caravan  2080001 & up    06/06/1993 
31 Firewall Modification Cessna 208 Caravan  2080001 & up    01/26/1994 
32 Install cover – wheel well 4000 Amphibs  All    03/01/1994 
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    09/15/1994 
34 Nose gear shimmy info 6000/6100 Amphibs  DHC 2 MK I, MK III    12/05/1996 
35 Conversion of Model 8000 hull (Cessna 208) to Model 8000 (DHC – 3) hull 8000 floats  DHC-3 Otter    01/24/1996 
36 Rear strut – aft attachment – Twin Otter DHC-6 Twin Otter Model 300 with 13000 floats  130001-130022    12/04/1996 
37 Install oil filter for float hydraulic system DHC-6 Twin Otter Model 300 with 13000 floats  All    01/20/1997 
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    11/04/1997 
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 
  07/27/1998 
42 Firewall Modification – Plate Caravan 208/ with 8000 floats  20800001 and Up    04/26/1999 
43 New Wheel and Brake Assembly 3000, 3450, 6000, 8000 Floats  N/A    06/01/2000 
44 Firewall Modification – Fitting Lower Firewall Caravan 208/ with 8000 Floats  20800001 and Up    03/24/2000 
45 Modification – Main Landing Gear 3450 Floats  34001 - 34032    09/20/2000 
46 Modification – Main Landing Gear 3000 Floats  30001 - 30046    09/20/2000 
47 Installation of Hinged Access Covers to Float Top Deck 13000 Floats  Optional All 13000 Series Floats  07/15/2010 
48 Addition of Hydraulic Accumulator Wipline 2100, 2350, 3000 and 3450 series amphibious floats    03/15/2006 
49 Placard-Floatplane Airspeed Limitations PA-18 Floatplane  Float S/N 276 & Down, with 2000 lb Gross Wt Kit    09/04/2001 
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.    11/06/2000 
51 Modification-Foam filled float Boosters 2100 & 2350 Floats  2100 & 2350 Floats  07/13/2005 
52 Modification – Main Landing Gear 2100 & 2350 Floats  2100 Floats S/N 21232 and lower, 2350 Floats S/N 21032 and lower    04/25/2002 
53 Installation – Chinese Baggage placards 8000 Floats  80211A, 80212A, 80213A, 80214A, 80227A, 80228A, 80247A, 80248A    06/03/2002 
54 Installation – Shock Strut – Metering Tube 8000 Floats  80244 and DN    06/17/2002 
55 Main Landing Gear Shock Strut Replacement 2100A, 2350A Floats  2100A S/N's 21327A, 21328A, Updated, 21344A & DN, 2350A S/N 23046A & DN    02/18/2003 
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, 3450A  2100A S/N's:21412 & DN    10/01/2003 
58 208 Seaplane Float Spreader Bars – Heavy Duty 8000 Floats  S/N 80230 & DN    10/01/2002 
59 Removal of Main Gear Tunnel for Seaplane Floats 13000S Floats  All Seaplane Floats    02/17/2003 
60 Installation of Pressure Switch Diode 3730 A Floats  All    06/16/2003 
61 Main Gear Roller Inspection / Torque Arm Replacement 3000, 3450 A Floats  30001A to 30082A, 34001A to 34066A, 30001A to 30118A, 34001A to 34128A    08/28/2003 
62 NOSE WHEEL SHIMMY WIPLINE 2100/2350 SERIES AMPHIBIOUS FLOATS  All    09/15/2003 
63 Addition of vent ball stop AT-802A Fire Boss  SN: 154,155,168,169    04/06/2004 
64 PA-18 Wide Body Cub modification for 2000lb gross weight, landplane and floatplane. PA-18 Wide Body Cub  SN's AF18162 & Down - Wide Body Cubs only. Ref. STC SA02187AK    05/24/2004 
65 #7 Bulkhead 3000 - 3450  All model 3000 S/N 30133 and up. All model 3450 S/N 34159 and up.    02/03/2005 
66 Nose wheel shimmy Wipline 2100, 2350, 3000 and 3450 series amphibious floats      09/09/2004 
67 Model 2100 and 2350 weight revision. Model 2100 and 2350 floats      08/30/2004 
68 Model 3000 and 3450 weight correction. Model 3000 and 3450 floats      08/23/2004 
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 -----  07/20/2005 
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    04/06/2006 
72 802 Air Tractor Float Longeron and Float Bracket Repair AT-802 aircraft with Wipaire 10000 Floats    04/06/2006 
73 Aviat A-1 operation at A-1A Gross Weight through Aviat Service Bulletin 13 Aviat Husky A-1 on 2100 floats      03/01/2005 
74 Removal of Horizontal Panel and Trunion on Seaplane Floats for Weight Reduction 13000 floats      06/08/2005 
75 Model 2100 and 2350 weight correction Model 2100 and 2350 floats    06/27/2005 
76 AT-802 Fireboss Finlet Inspection & Repair AT-802 w/ Fireboss conversion  all serial numbers    10/05/2005 
77 Updates for the Husky Long Flap Installation Husky A-1B with 110" Flaps and 2100 Floats  A/C S/N's: 2285, 2288, 2289, 2291 & Up  01/27/2006 
78 AT-802 Fire Boss brake line lengthening 10000 Amphibious Floats  AT-802 S/N 10001-10052    04/06/2006 
79 AT-802 Fire Boss Gear Position Switch Brackets 10000 Amphibious Floats  All AT-802 aircraft    04/06/2006 
80 AT-802 Fire Boss Slide Tube Corrosion 10000 Amphibious Floats  All AT-802 aircraft    04/06/2006 
81 AT-802 Adding Larger Water Rudder Stop on Aft Bulkhead 10000 Amphibious Floats  AT-802 S/N 10001-10052A    04/20/2006 
82 AT-802 Fire Boss Forward Upper Brace Supports 10000 Amphibious Floats  All AT-802 aircraft    05/31/2006 
83 AT-802 Fire Boss Shock Strut T-Seal Change 10000 Amphibious Floats  All AT-802 aircraft    06/30/2006 
84 Intentionally left blank        
85 Baggage Door Lip and Sealing 2100, 2350, 3000, 3450, 6000, 8000 Floats  All    06/30/2006 
86 Cessna 206H Drain Hole Grommets All 206 STC Applicable Float Sizes  Cessna 206H (other models optional only)    07/20/2006 
87 Inspection Cover Upgrade All 2100, 2350, 3000, 3450 Amphib and Seaplane Floats      08/30/2006 
88 Cessna 172 Heavier Drag Wire Brace Cessna 172,172XP - 2100, 2350 Floats      09/05/2006 
89 Installation Fuselage Frame Tubing Repair and Installation Revised Kicker Strut Air Tractor AT-802A - 10000 Float    09/25/2008 
90 Installation of Additional Filters for the Scoop Hydraulic Solenoid Valve Air Tractor AT-802A - 10000 Float      01/25/2007 
91 Installation of Modified Main Wheel Seals Air Tractor AT-802A, de Havilland DHC-6- 10000 Float, 1300 Float      01/25/2007 
92 Air Tractor Float Brackett Welding Repair, S/N 217 and Similar Air Tractor AT-802A - 10000 Float    03/31/2007 
93 AT-802 Asymmetric Scoop Position Indicator Upgrade Air Tractor AT-802A - 10000 Float    03/22/2007 
94 Fire Boss Foam Tank Securing Air Tractor AT-802A - 10000 Float    08/03/2010 
95 Slide Tube End Machining Repair Cessna 208 Caravan - 8000 Amphibious Floats  8000 Amphibious Floats - 80323 & 80324    06/01/2007 
96 Caravan Under-Wing Mounted Hobbs Meter Switch Cessna 208 Caravan  Amphibious or Seaplane Floats    08/14/2007 
97 Nose and Main Gear Actuator Replacement 2100,2350,3000,3450 Amphibious Floats    02/07/2014 
98 Main Gear Ram Inspection and Improvement All Amphibious 6100, 8000, 10000, 13000 Floats    02/01/2012 
99 T-Seal Upgrades for Main Gear Ram and Nose Actuator 6100, 8000, 10000, 13000 Amphib floats    02/24/2012 
100 Retrofit step-struts for a grease hole 3450, 8000, 9000 13000 Amphib. and Seaplane floats    06/25/2008 
101 Wipline 10000 Floats Baggage Floor Repair Wipline 10000 Floats    11/26/2008 
102 Lake and Air Gear Advisory Information All  Wipline Amphibious Floats  01/30/2009 
103 Fire Boss spin-on hydraulic filter revision 10000 Amphibious Fire Boss    04/15/2009 
106 8000 Water Rudder Pivot Shaft and Springs Inspection Single Otter, 8000 Amphibious or Seaplane Floats    05/30/2010 
107 Turbo Beaver AFMS change. 6100 Floats    06/15/2010 
108 Kodiak Top Arm Modification, 7000 Main Gear Quest Kodiak on 7000 Amphibious Floats    10/15/2010 
109 Heavy seas strut package option Quest Kodiak on 7000 Floats    09/09/2010 
110 Forward Strut Attach Bulkhead Fatigue Crack 10000 Amphibious Floats    11/03/2010 
111 8000 Float Water Rudder Lock Enhancement Cessna 208 Caravan 8000 Amphibious or Straight Floats    01/25/2012 
112 Optional Hydraulic Power-Pack Timer Relay Installation 2100, 2350, 3000, and 3450 Amphibian Floats    04/09/2014 
114 Grease seal vent hole addition for main landing gear bearings Amphibious float models 3000A, 3450A, 6000A, and 8000A    02/21/2011 
119 Reposition elevator down spring attachment tab. Quest Kodiak on 7000S or 7000A    03/30/2011 
120 Bushing repair for forward, lower center fuselage bow tie mounting plate 13000    04/12/2011 
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    08/03/2011 
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    08/03/2011 
123 Quest Kodiak modified axle beam bushing. Quest Kodiak 100, Wipline 7000 Floats    08/30/2011 
125 Bow Bulkheads, Lower Flange Reinforcement 8000  All    09/26/2011 
126 Stern Bulkheads, Lower Flange Reinforcement Fire Boss Air Tractor 802 & 802A with Wipline 10000 Floats  10118 and prior  12/07/2011 
127 8000 Nose Gear End Cap Cracks 7000A, 8000A  up to and including Model 8000 SN 80398 and Model 7000 SN 70030  12/11/2012 
128 Main Landing Gear Gravel Deflector Installation Quest Kodiak on Wipline 7000 Floats    05/07/2013 
129 Cessna 208 Drain Hole Scuppers C208 on 8000 Amphib and Straight Floats    03/29/2012 
130 Alternate Wheel Bearing Grease for Float Landing Gear All Makes and Models    03/29/2012 
131 Husky Model A-1B/A-1C 2250 Lb Increased Gross Weight Wipline 2100 Floats for Husky A-1B, A-1C-180, A-1C-200    IR  06/29/2012 
132 Large Water Rudder Installation Wipline 6000 and Wipline 6100 floats    06/22/2012 
133 Structural Reinforcement, Exhaust Deflector Installation Quest Kodiak 7000    04/25/2012 
134 Twin Otter/13000 Lower Bow Strut Fitting Life Limit Viking DHC-6 Twin Otter on Wipline 13000 floats    08/27/2012 
135 Large Water Rudder Installation Quest Kodiak 100 on Wipline 7000 Floats    08/01/2012 
136 3000/3450 Nose Box – Finger Tab Installation 3000 Amphibian and 3450 Amphibian    07/08/2013 
137 Installation of Angle Reinforcement on Model 7000 Aft Bulkhead Quest Kodiak 100, Wipline 7000 Floats  Prior to 70033A  11/19/2013 
138 10000 and 13000 Nose Gear End Cap Cracks 10000A and 13000A    12/11/2012 
139 Main Landing Gear (MLG) Threaded Coupler 2100, 2350    03/15/2013 
140 Main Landing Gear (MLG) Threaded Coupler 3000, 3450    03/15/2013 
143 Main Landing Gear Proximity Switch 2100A, 2350A  2100A - SN 21862A and below, 2350A - SN 23150A and below.  07/30/2014 
144 Drag Strut Attachment, Washer Replacement 10000 Amphibious Floats    01/18/2016 
145 Drag Strut Attachment, Top Deck Repair 10000A    04/30/2013 
146 13000 Bulkhead #6 Crack Repair 13000  13188 and Below  04/03/2015 
147 Quest Kodiak Hydraulic Pump Electrical Wire Routing Correction Quest Kodiak 7000    04/24/2013 
148 3000/3450 Gear Snubber Addition and Actuator Part Modification 3000A, 3450A    09/10/2013 
149 Air Tractor Long Finlet Support Strut AT802A w/ PT6A-67F (1600 HP) AT802 (2-Place)With Wipline 10000 Floats    07/29/2016 
151 Replacement Grove Wheel 2100A, 2350A, 3000A, 3450A    09/02/2013 
152 Main Gear Oleo Cylinder Piston Movement 7000, 8750    04/01/2014 
153 Float Pump Out Tube Inspection All    10/24/2013 
154 Main Gear Oleo and Top Arm Replacement 8750A, 7000A    06/24/2014 
155 Front Strut Fittings Replacement 7000  70001-70030  12/19/2014  
156 Plugged Bulkhead Sealant Removal 7000A, 8750A, 8750S    03/19/2014 
157 10000 Bulkheads 9-12, Lower Flange Reinforcement 10000    01/15/2015 
158 Air Tractor Short Finlet Inspection and Support 10000A    12/30/2014 
159 13000 Scuff Plate Installation 13000    01/16/2015 
160 Anode Installation on Floats 7000A, 8750A, 7000S, 8750S, 8000A, 8000S    05/08/2017 
161 3450 Snubber Mount Repair 3000A, 3450A    06/15/2015 
162 Main Gear Actuator Replacement 7000A, 8750A  7000A SN 70032 and below, 8750A SN 87106 and below  08/24/2015  
163 8750 terminal strip corrosion 8750A    10/11/2016 
164 8750 Power Pack O-ring Replacement 8750A    10/26/2015 
165 Air Tractor Airspeed Placards 10000A    04/15/2016  
166 Air Tractor Short Finlet Support Strut Removal 10000A    12/04/2015 
167 10000 Probe Jack End Plug Loosening 10000A    04/27/2016 
168 10000A and 13000A Main Gear Drag Brace Tube Repair 10000A, 13000A    03/22/2017 
169 8750 Pylon Nutplate Corrosion 8750A    08/17/2016 
170 Air Tractor Empennage Cracks AT-802, AT-802A, 10000A Floats    10/24/2016 
171 8750A Main Gear Oil Bath Wheel System Cessna 208, Cessna 208B, 8750A Floats    10/24/2016 
172 8750A Bulkhead 9 Cracking Cessna 208, Cessna 208B, 8750A Floats    6/21/2017 
174 3000A/3450A Main Landing Gear Shaft Replacement 3000A, 3450A, Cessna 180 (through K model), 185 through E model), A185E, A185F, 182 (P through T model), 206H, T206H, T/U206 (through G model) Maule M6-235, M7-235, M7-260, M7-420, MT7- 235, MT7-260, MT7-420, MX7-235    12/19/2016 
175 10000A Forward Strut Spacer Installation Fire Boss, 10000A    01/05/2017 
178 8000 Baggage Compartment Tie-Down 8000S, 8000A - de Havilland DHC-3 Otter, Cessna 208 Series    5/4/2017