From the above manual I would say that this section probably applies (as the Skyecho is not an EFB) :-
3.7 Installation of small cameras and similar devices inside aircraft
Note: This section is only applicable to mounting small devices inside an aircraft. It is not applicable to mounting
devices on external surfaces – the regulations and safety considerations are different in those scenarios.
3.7.1 From time to time CASA receives enquiries about the rules and requirements for
mounting small cameras and similar devices inside aircraft, in particular about whether
the airworthiness regulations are applicable and a Part 21 modification design approval
is required.
3.7.2 The airworthiness regulations are primarily about certifying the approved design of
aircraft and required operational equipment, manufacturing those products and
thereafter ensuring they remain airworthy. The continuing airworthiness and
maintenance regulations are framed in relation to the approved design and the terms
aircraft components (CAR) and aeronautical products (CASR). Aircraft components and
aeronautical products include parts of aircraft as specified in the Part 21 approved
design of the aircraft, and equipment required by the regulations for operation of the
aircraft.
3.7.3 A small camera, or similar device, is not an aircraft component or an aeronautical
product if it is:
a. not included in the approved design of the aircraft; and
b. mounted in a way that does not affect the approved design of the aircraft; and
c. not required equipment for the operation of the aircraft.
3.7.4 Mounting a small camera, or similar device, in accordance with the above criteria is not
a change to the approved design of the aircraft and is not maintenance of the aircraft. A
Part 21 modification design approval is not required in those circumstances.
3.7.5 The approved design of the aircraft would be affected by physical changes to a part of
the aircraft, such as drilling holes. The approved design of the aircraft would not be
affected by mounting means such as a suction cup.
3.7.6 Under CAO 20.16.2, a small camera, or similar device, that meets the above criteria is
cargo. It is therefore the operator and pilot in command’s responsibility to ensure that
the device is used, restrained and stowed in compliance with CAO 20.16.2 and such
that the safety of the aircraft is not adversely affected for the particular operation. A
formal approval from CASA or an ADO or authorised person is not required in these
circumstances.
3.7.7 The assessment by the operator and pilot in command will necessarily be on a case by
case basis considering the device, the mounting means, the mounting location inside
the aircraft and the operation. The physical size of the device is a relevant consideration
for mounting and safe operation, in particular, the mass and dimensions of the device
are relevant for determining the suitability of the mounting means and the mounting
location.
Personally I feel that using suction cups alone, as from our experience they frequently fall off in mid-flight, would be better augmented by something like velcro as some of us have described.
Cheers,
Neil