This is an MSL antenna on the underside of the aircraft; MSL is "Microwave Landing System". We are speculating that 590086 may have been involved in earlier tests of the MSL System; since it was originally a systems test aircraft. Unverified as of 6-13-2013
.

Due to the lack of TSD's available for museums; our crew at PCAM were forced to replicate one. Using plans provided by forum member Frank Borchardt, we were able to make one from wood and simulate the details. I created the "map" using a Google Map of the San Francisco Bay Area to facilitate visitors' recognition of what the TSD would display in use.

Due to the lack of TSD's available for museums; our crew at PCAM were forced to replicate one. Using plans provided by forum member Frank Borchardt, we were able to make one from wood and simulate the details. I created the "map" using a Google Map of the San Francisco Bay Area to facilitate visitors' recognition of what the TSD would display in use.

Due to the lack of TSD's available for museums; our crew at PCAM were forced to replicate one. Using plans provided by forum member Frank Borchardt, we were able to make one from wood and simulate the details. I created the "map" using a Google Map of the San Francisco Bay Area to facilitate visitors' recognition of what the TSD would display in use.

Due to the lack of TSD's available for museums; our crew at PCAM were forced to replicate one. Using plans provided by forum member Frank Borchardt, we were able to make one from wood and simulate the details. I created the "map" using a Google Map of the San Francisco Bay Area to facilitate visitors' recognition of what the TSD would display in use.

Due to the lack of TSD's available for museums; our crew at PCAM were forced to replicate one. Using plans provided by forum member Frank Borchardt, we were able to make one from wood and simulate the details. I created the "map" using a Google Map of the San Francisco Bay Area to facilitate visitors' recognition of what the TSD would display in use.

Due to the lack of TSD's available for museums; our crew at PCAM were forced to replicate one. Using plans provided by forum member Frank Borchardt, we were able to make one from wood and simulate the details. I created the "map" using a Google Map of the San Francisco Bay Area to facilitate visitors' recognition of what the TSD would display in use.

Due to the lack of TSD's available for museums; our crew at PCAM were forced to replicate one. Using plans provided by forum member Frank Borchardt, we were able to make one from wood and simulate the details. I created the "map" using a Google Map of the San Francisco Bay Area to facilitate visitors' recognition of what the TSD would display in use.

Due to the lack of TSD's available for museums; our crew at PCAM were forced to replicate one. Using plans provided by forum member Frank Borchardt, we were able to make one from wood and simulate the details. I created the "map" using a Google Map of the San Francisco Bay Area to facilitate visitors' recognition of what the TSD would display in use.

Due to the lack of TSD's available for museums; our crew at PCAM were forced to replicate one. Using plans provided by forum member Frank Borchardt, we were able to make one from wood and simulate the details. I created the "map" using a Google Map of the San Francisco Bay Area to facilitate visitors' recognition of what the TSD would display in use.