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The transponders for one thing don't have an 'off' switch it requires a lot of mechanical knowledge that requires specialized licenses to get into and rip the right parts of the airplane to get into
Aviation today
The Post 9/11 Transponder
By James W. Ramsey | June 1, 2002
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www.aviationtoday.com...
Cutting the Power
Another issue for the task force to consider has been power management. Besides disabling the transponder by switching the unit to "standby" on the control panel, hijackers could simply disconnect the appropriate circuit breaker. To prevent this would require changing the circuit breaker switch to ensure that the power supply was switched from the bus that hijackers could control to a secure power source.
One proposed method called for a third (independent) remotely mounted transponder. But considering the retrofit cost to the operators–including aircraft downtime to install and rewire the new system–the task force rejected the idea.
edit on 29-6-2022 by neutronflux because: Added