398 Buses, Wrightbus, 2010 [WAB]
Kowloon Motor Bus (KMB) first introduced this model in January 2010, months earlier than SBS Transit in Singapore. Orders totaling to 398 units were placed with Volvo Buses in 5 batches spanning over multiple years, and KMB is currently the largest operator of B9TL Euro V buses in Hong Kong. They were designated as the AVBWU class. As with SBS Transit, KMB previously purchased several production B9TL Euro III units and one Euro IV demonstrator from Volvo Buses.
The bodywork chosen was the second-generation Wright Eclipse Gemini II (WEG2), a direct successor to the previous Wright Eclipse Gemini bodywork fitted on KMB's AVBW class. The WEG2 bodywork was supplied by Wrightbus of Ballymena, Northern Ireland.
These buses were powered by the Volvo D9B310 EC06B engine (9,364cc) which is Euro V compliant with the use of Selective Catalytic Reduction (SCR) technology, requiring the use of Adblue. They were all fitted with the new generation 6-speed ZF EcoLife 6AP 1403B automatic transmission.
The first three batches, consisting of AVBWU1 to AVBWU290 were nearly identical to each other. They were fitted with Vogelsitze System 400 seats, and the supply of EDS units were shared between Hanover Displays, Hong Long and Gorba AG. The former two supplied flip-dot displays, while the latter supplied LCD displays. The forth and fifth batches, AVBWU291 to AVBWU398, were configured for higher carrying capacity, fitted with Vogelsitze Revo S seats and use full-LED EDS either from Hanover Displays or Gorba AG.
Additionally, KMB has received both shorter (10.6m) and longer variants (12.8m) of this bus model for further evaluation. Citybus and NWFB were also expected to B9TL WEG2 buses from 2015.