The Interflug Il-62 crashed back then because of a leaky bleed air pipe crossing the little known cargo compartment between the engines burned through insulation and some electrical wiring which ignited some barrel of deicing fluid that was carried there (not permitted per regs). And all that led to a fire, loss of control, inflight breakup and loss of all lives.
The type received modifications afterwards.
ASN Aircraft accident Ilyushin 62 DM-SEA Knigs Wusterhausen