Uklarert stigning - Farlige greier - Curt Lewis

Incident: NAC B744 near New Delhi on Dec 23rd 2018, climb without clearance causes loss of separation with two aircraft

A NAC National Air Cargo Boeing 747-400, registration N919CA performing flight N8-840 from Bagram (Afghanistan) to Hong Kong (China), was enroute at FL310 about 65nm northeast of Delhi (India) when the crew requested to climb to FL350, ATC replied "Standby, expect FL350". The aircraft began the climb to FL350 however. A KLM Boeing 777-300, registration PH-BVB performing flight KL-875 from Amsterdam (Netherlands) to Bangkok, was enroute at FL330 exactly above N919CA. An Eva Air Boeing 777-300, registration B-16716 performing flight BR-61 from Bangkok (Thailand) to Vienna (Austria), was enroute at FL320 on the same airway in opposite direction. When the 747 began the climb an alert activated at the controller's desk, who in response immediately turned the 747 to their left off the airway and as a precaution turned the Eva Air to their left, too. TCAS advisories occurred between the 747 and the two other 777s, the 747 reached a maximum FL330 then began to descend again already turned to their left and was subsequently cleared to climb to FL350. All three aircraft continued to their destinations for safe landings. According to ADS-B position data the separation between N8-840 and KL-875 reduced to 0 feet vertical and 2.2nm horizontal at 05:04:43L (23:34:43Z Dec 22nd).