Physical Security Measures for Aircraft
While surveillance, access controls, and physical security measures at airports can provide effective deterrents, these measures may be costly and challenging to implement at many GA airports, especially smaller airports.  Measures to physically secure aircraft can be viewed as either an additional layer of security to prevent theft and unauthorized access to aircraft at airports with extensive surveillance and access controls or as a primary means of security at some airports with more limited security capabilities.
Physical security measures for aircraft may include cabin and ignition locks that may already exist for certain aircraft as well as supplemental immobilizing devices
71 Transportation Security Administration.  Security Guidelines for General Aviation
Airports.
72 Ibid.
73 Ibid.

such as propeller, throttle, control surface, and tie-down locks.  The TSA’s Security Guidelines for General Aviation Airports recommends storing aircraft in locked hangars, consistent use of aircraft door locks, using keyed ignitions when appropriate, and not leaving keys in aircraft as some basic steps to secure GA aircraft.  The guidelines also recommend using an auxiliary lock such as commercially available propeller, throttle, or tie down locks to further protect GA aircraft.  The TSA suggests that “[p]ilots should employ multiple methods of securing their aircraft to make it as difficult as possible for an unauthorized person to gain access to it.”  However, it is apparent that this common sense advice is not always heeded.  In the October 2005, theft of a Cessna Citation VII business jet, it was reported that the aircraft – which does not need a key to start – was left unlocked.74
While building or renting secured hangar space may be cost prohibitive to many light aircraft owners, locks and other security devices may provide a common sense, cost effective means to reduce the vulnerability of GA aircraft to theft.  Given that aircraft are high value assets, locks may offer a relatively low-cost means to reduce vulnerability.  Purchasing and installing secondary locks could benefit aircraft owners and operators by providing added protection against theft and unauthorized access.
In the absence of explicit federal standards or requirements, some states have taken initiatives to require specific actions for securing GA aircraft.  New Jersey, for example, has implemented a state-wide “two-lock rule” requiring any aircraft parked or stored at a GA facility within the state for more than 24 hours to either secure the aircraft with two distinct locking devices or disable the aircraft in a manner to prevent theft or illegal use.75 The Strengthen Aviation Security Act (H.R. 2649) would require airport operators to ensure that “...all general aviation aircraft, while parked at such airports, are secured by a visible immobilizing device (such as a prop lock).”  Propeller locks and throttle locks may provide relative low cost, relatively effective deterrents to unauthorized use and theft of aircraft. 
　
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