The club members concerns have been with a loss of control and a search of the internet has revealed other fliers have had similar incidents.

Some solutions have been down to correct positioning of the TX and Rx aerials.

Also the Spektrum website has a list of potential problems with this transmitter and the required action.

The faults listed by Spektrum are:

1.

 A fault within the trainer jack plug can cause a short circuit within the transmitter causing component damage.  Check the product identification code (PID code) inside the battery compartment. If the code is HA906X or HA907X then the unit should be   returned to Horizon Hobbies for rectification (regardless of whether you intend to use the trainer jack plug or not).

2.

A fault with the stick potentiometers causing hesitation or jerking in the servo movement. Radios with a date codes of 809E, 810E, 811E, 812E should be carefully checked. If your radio does not have a date code, the test is still advisable. A check is listed on the Spektrum website to determine if a fault is present but they do advise a check of control operation before every flight. Faulty units need to be returned for rectification.

3.

 A fault with the transmitter's charge jack being incompatible with the supplied wall charger. The diameter of the centre pin on the charge jack in the transmitter is too large for the supplied wall charger. Faulty units need to returned for rectification.

Concerns have also been expressed about the use of dry cell batteries in this Tx. The BMFA (page 20 of handbook) advise that dry cells are soldered into packs and hardwired to the equipment and never to rely on spring type connections.

in light of these concerns the committee would advise anyone using this equipment to check the above concerns before flying to ensure they encounter no adverse flight conditions and to ensure aerials are positioned as per recommendations to get proper reception.