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Service Letters

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10000A, AT-802A Only
Rev: A
04/16/2025
All amphibious floats
Rev: A
07/07/2026
DeHavilland DHC-2, DHC-3, DHC-6 Pilatus PC-6 Textron Aviation 208, 208B Air Tractor AT-802, AT-802A, 6000A, 6100A, 8000A, 8750A, 10000A, 13000A
Rev: A
02/11/2026
Air Tractor AT-802A, AT-802, 10000A
10213A and later
Rev: B
06/01/2026
Air Tractor AT-802A, AT-802, Textron Aviation 208, Pilatus PC-6/B2-H4, DeHavilland DHC-2, DHC-3, DHC-6, 6000A, 6100A, 8000A, 10000A, 13000A
Rev: A
04/15/2026
DeHavilland DHC-6-200 & DHC-6-300, 13000A, 13000S
Rev: A
03/13/2026
Textron Aviation 180, 182, 185, 206 Maule M-7-260, M-7-260C, MT-7-260, M-7-235, M-7-235B, M-7-235C, MT-7-235, M-6-235, M-7-420A, M-7-420AC, MX-7-235, MT-7-420, 3000A, 3000S, 3450A, 3450S
3000 Floats: S/N 30312 and prior and 3450 Floats: S/N 34324 and prior
Rev: A
03/13/2026
Air Tractor AT-802 and AT-802A, 10000A
Rev: C
07/27/2026
DeHavilland DHC-6, 13000S, 13000A
Rev: B
04/15/2026
DeHavilland DHC-6, 13000S, 13000A
Rev: A
01/26/2026
AT-802, AT-802A, 10000A
Rev: A
02/06/2025
AT-802, AT-802A, 10000A
Rev: B
03/17/2026
AT-802, AT-802A, 10000A
Rev: B
05/14/2025
AT-802, AT-802A, 10000A
Rev: C
01/15/2026
AT-802, AT-802A, 10000A
S/N 10001A - 10314A, 10333A - 10342A: Spherical bearing pivot block, 3-piece nose fork, fixed centering spring, S/N 10315A - 10332A, 10343A - 10408A: Tapered bearing pivot block, 3-piece nose fork, fixed centering spring, S/N 10409A and later: Tapered bearing pivot block, single-piece nose fork, adjustable centering spring
Rev: E
04/27/2026
Cessna 180, 182, 185, 206, M-6-235, M-7-260, M-7-260C, MT-7-260, M-7-235, M-7-235B, M-7-235C, MT-7-235, M-7-420A, M-7-420AC, MX-7-235, MT-7-420, 3000A, 3450A
N/A
Rev: B
01/15/2026
2100, 2350
See Effectivity Table
Rev: A
05/19/2025
Air Tractor AT-802A & AT-802, 10000A
N/A
Rev: B
04/29/2025
Air Tractor AT-802, AT-802A, 10000A
N/A
Rev: A
04/18/2025
Air Tractor AT-802 & AT-802A, 10000A, Landplane
Rev: E
01/05/2026
Textron Aviation 180, 182, 185, 206 Maule M-6-235, M-7-260, M-7- 260C, MT-7-260, M-7-235, M-7- 235B, M-7-235C, MT-7-235, M-7- 420A, M-7-420AC, 3000A, 3450A With Aluminum Main Gear Only
30315A and later, 34317A and later
Rev: B
10/29/2024
Air Tractor AT-802 & AT802A, 10000A
10269A through 10408A
Rev: C
12/22/2025
DeHavilland DHC-2 MK 1 with 5600 lbs Gross Weight Increase on EDO 4930 Floats Only
Rev: C
12/10/2024
2100A, 2100S, 2350A, 2350S, 3000A, 3000S, 3450A, 3450S, 6100A, 6100S, 8000A, 8000S, 8750A, 8750S
Rev: A
01/18/2024
Textron Aviation 208, 208B, Air Tractor AT-802 & AT-802A, DeHavilland DHC-6, 8750A, 10000A, & 13000A
Rev: D
04/15/2026
Air Tractor AT-802 & AT-802A, 10000A
Rev: B
04/30/2026
DeHavilland DHC-6, 13000S
Rev: B
05/23/2024