Demonstrating the 120-minutes ETOPS capability per AMC-20-6 revision 2 for RB211-535E4-powered Boeing
757-200 series aeroplanes.
ETOPS
ETOPS approval
With this STC Aptoz demonstrates that with three reliable and independent electrical power sources
available i.e. configured without the Hydraulic Motor Generator (HMG) those aeroplanes – termed per
Aptoz terminology as Supplemental ETOPs or S-ETOPS - could qualify for the 120-minute ETOPS as per
AMC-20-6.
ETOPS approval