code: def deactivateAaPdpContextRequest():
      
      a = TpPd(pd=0x8)
      b = MessageType(mesType=0x53)  # 01010011
      c = AaDeactivationCauseAndSpareHalfOctets()
      packet = a / b / c
      return packet
docs: DEACTIVATE AA PDP CONTEXT REQUEST Section 9.5.13