Page 24 - April24T

OEI
One-Engine Inoperative
In the February T&T, we looked at Obstacle Departure Procedures (ODPs) and Standard Instrument
Procedures (SIDs). Today, let’s see what happens if an engine fails dur- ing takeoff or shortly after departure. It is interesting to note that pilots fly- ing under FAR Part 121 and 135 while departing an airport under IFR are required to use an engine-inoperative takeoff obstacle clearance or avoid- ance procedure. The Instrument Procedure Handbook states that the One-Engine Inoperative (OEI) assess- ment planning process “is separate and independent of the IFR depar- ture procedure associated with the all-engines-operating climb gradient requirements.” Another interesting note is that the FAA does not require but rather “encourages” Part 91 opera- tors to follow the same OEI planning process. Although most of my flying has been Part 121 and 135, all the Part 91 operations I flew followed the recommendation and conducted OEI planning. The consequence of not doing this could be grave.
by Ed Verville
The industry standard has been to
purchase tailored Engine-Out Proce-
dures (EOPs) from a business such as
Aircraft Performance Group (APG) or
ForeFlight. I have used APG for many
airplanes, including CRJs, Boeings
and Challenger Jets. I currently use
ForeFlight for the Challenger Jets I fly. The one-engine inoperative procedure is a designed flight path considering aircraft performance, weight, and obstacle clearance along the OEI flight path track. But unlike ODPs and SIDs that show required climb gradients, the OEI procedures display their information in max takeoff weight. The higher the required climb gradient, the more the maximum takeoff weight is reduced. Part of our standard protocol is to brief the departure procedure for a normal two-engine depar- ture and the one-engine inoperative procedure in case of an engine failure.
22 • TWIN & TURBINE / April 2024
Eagle, CO KEGE
The Engine Out Procedure may be:
1. Fly runway heading.
2. Tailored route.
3. Identified as a SID (may or may not be your assigned SID).
Most EOPs dictate flying runway heading or straight out; however, the procedure will provide a route to follow if there are obstacles or terrain in the path. ODPs and SIDs begin their obstacle clearance assessment at 35 feet above