US-China tensions: USAF spy plane disguises itself as a Philippine aircraft over Yellow Sea, monitor says
- RC-135S aircraft switched its identification code during a reconnaissance mission, South China Sea Strategic Situation Probing Initiative says
- US Air Force has used a similar trick more than 100 times already this year, Chinese foreign ministry says
Hex codes are assigned by the International Civil Aviation Organisation to all aircraft as a means of identifying them.
When it was over the Yellow Sea, the RC-135S reconnaissance aircraft used a hex code allocated to a Philippine aircraft, but reverted back to its original number after completing its mission, the SCSPI said.
Last week the SCSPI said American RC-135s electronically disguised themselves as Malaysian civilian aircraft while flying close to Chinese airspace. The switch was also reported by Popular Mechanics magazine and several independent observers.
Analysts said the incident suggested America was stepping up its surveillance of China and its tactics could stoke tensions between the two sides.
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Kenneth Wilsbach, head of the USAF’s Pacific Air Forces, said the aircraft had followed international rules regarding transponders.
“I know we follow the rules for international airspace and we were following the rules that day,” he said.
“If a USAF spy plane is spotted within range, such activities [by the PLA] will be silenced,” he said. “But if it appears to be a civilian plane, they might go on as normal and be recorded and analysed.”
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“There are clear restrictions on the type of action air defences can take against suspicious aerial activity,” he said.
“The layers of procedures to ascertain the identity of the aircraft, to the set of measures that can be taken, especially in a non-war situation, can be pretty restrictive.”
Ni said that although the US spy planes were an annoyance for China they always stayed outside its territorial airspace of 12 nautical miles.
“So technically they are in international airspace and the PLA can’t actually shoot them down or do too much,” he said.
“But the PLA has been keeping count, which means they can see through the disguise.”