ULL Dynamic WT9 Publications

Mandatory Service Bulletins

Document No.TitleDate of IssueRevRevision DateCancel Date
List_of_Bulletins_ULL_472,5_20240503List of Bulletins3.5..2024---
ZB WT9 01A/2003Check of the landing gear legs
attachment.
24. 9. 2003---
ZB WT9 02A/2006Elevator play check and its
elimination.
26. 10. 2006---
ZB WT9 03A/2007Securing of the brushes of propeller
speed control unit
25.1.2007---
ZB WT9 04A/2007Reserved25.1.2007---
ZB WT9 05A/2007Replacement of planetary gearbox
gear wheels of propeller adjustment
mechanism and inspection of
mechanical stops of minimal angle
of attack of propeller blades.
17.10.2007---
ZB WT9 06A/2008Replacement of fuel connection
hose (ø18 mm) between central
section fuel tank and wing fuel tank
3.7.2008---
ZBWT9 07A/2008Throttle lever nut locking.27.11.2008--
ZBWT9 08A/2008The engine bed used in fixed landing
gear version.
15.10.2008---
ZBWT9 09A/2008Change in the Operating,
Maintenance and repair manual for
aeroplane WT 9 Dynamic, page 3-8.
Completion of the item 6.1.1 Wing
disassembly into a Periodic
inspection listing.
20.10.2008---
ZBWT9 10A/2008Change in Flight Manual for
aeroplane WT-9 Dynamic, pages
0-4, 0-5, 3-5, 3-6.
14.01.2009---
ZBWT9 11A/2009E10 fuel use approval (Unleaded
gasoline blended with 10% ethanol)
and WT-9 Dynamic Normal
procedures for Airplane securing
modification
05.10.2009---
ZBWT9 12A/2010Change in the WT-9 Dynamic
maintenance schedule (canceliation
of the airframe 50h periodical
inspection
11.11.2010---
ZBWT9 13A/2011Exhaust silencer06.05.2011---
ZBWT9 14A/2011Change in WT- 9 Dynamic Flight
Manual and Operating,
Maintenance and repair manual
12.09.2011---
ZBWT9 15A/2011Check of crankshaft journal (power
take off side) for Rotax engine type
912 and 914 (Series).
30.11.2011---
ZBWT9 16A/2012Swing bearings and flaps push
rods check
24.09.2012---
ZBWT9 17A/2012Change of Time between overhaul
intervals (TBO) of Woodcomp
propellers
26.11.2012---
ZBWT9 18A/2013 Rev. 1Airbox and carburetor drain / vent
connection.
20.03.2014120.03.2014-
ZBWT9 19A/2015 Rev. 1
Modification or replacement of water
thermostat.
21.04.2015121.04.2015-
ZBWT9 20A/2016Exhaust silencer FG11.08.2016---
ZBWT9 21A/2016Added warning for performing of
sideslip maneuver into the POH
11.08.2016---
ZBWT9 22A/2018Inspection of nose fixed landing gear
WT-9 Dynamic.
15.08.2018---
ZBWT9 23A/2020Inspection of gap between the
elevator root hinge assembly and the
vertical stabilizer skin.
25.08.2020---
ZBWT9 24A/2020Replacement of the main and auxiliary
fuel pump check valves on the aircraft
equipped with engine Rotax 914UL.
28.08.2020---
ZBWT9 25A/2020Installation of parachute front spacer
between firewall and parachute fabric
container.
21.12.2020121.12.2020-
ZBWT9 26A/2021Engine mount inspection of aircraft
with fixed landing gear and engine
Rotax 912 iS.
12.03.2021---
ZBWT9 28A/2023Increase of maximum takeoff weight (MTOW) to 600 kg.7.12.2023115.12.2023-
ZBWT9_29A_2024_R0Inspection of the emergency parachute cover9.2.2024
---
ZBWT9_30A_2024_R0Installation of forward fuel pump3.5.2024---

Information Bulletins

Document No. TitleDate of IssueRevRevision DateCancel Date
List_of_information_bulletinsList of information Bulletins17.10.2013---
IBWT901/2013Characteristics of the Rotax fuel pump P/N 89311014.10.2013---

Recommendations

Document No. TitleDate of IssueRevRevision DateCancel Date
20190404_List_of_recommendations_ULLList of Reccomendations4.4.2019---
DVWT9_01BChange of the air filter22.9.2004---
DVWT9_02BFuel management22.9.2006---
DVWT9_03B_SKNose undercarriage leg drive play inspection20.1.2006---
DVWT9_04B_SKSecuring of the transparent inspection window on the wing underside.30.6.2006---
DVWT9_05BReplacement of fuel connecting houses of wing fuel tanks. Adding of conductive connection between wing and central section fuel tanks25.4.2007113.6.2007-
DVWT9_06BFuel cock – 3 way;
Fuel cock – 2 way, aplicable only for aeroplanes equipped with two fuel cocks
31.5.2007---
DVWT9_07BMetal parts corrosion
Front leg of fixed landing gear
Flaps torsion tube
Elevator actuating bracket
5.12.2007---
DVWT9_08BLocking of the wing’s main pin by the Fokker pin.3.9.2008---
DVWT9_09BOptional modification of filter holder with preheating.26.11.2012
DVWT9_10BInstallation of canopy lock with safety latch and sensor.26.11.2012---