OYSN RW18 One Engine Out Missed Approach

A few days ago, one of this blog follower asked me some questions on an one engine out missed approach. He gave an example of missed approach procedure of Sanaa Intl. airport ILS RW18. The chart is shown below. 

I will simulate this missed approach procedure with one engine out in WinPEP using A320-231 aircraft. Calculation type is from any point in flight. The initial conditions and its screenshot are shown below.

• Air Con: On, Anti Ice: Off
• Engine level: average, thrust level: idle
• Configuration: FULL
• Weight: 66000 kg (MLW)
• Altitude: 7665 ft (height of 500ft)
• Speed: 150 KIAS
• Direction: 179 deg
• Landing gear: down
• Engine out: 0

The procedure consists of several flight segments and its first segment screenshoots are shown below:

1. Landing gear change, thrust rating: go around, engines out: 1
2. Aero. conf. change: CONF 3
3. Aero. conf. change: CONF 2
4. Climb to QNH 8000 ft
5. Thrust rating: max continuous, acceleration to S speed
6. Aero. conf. change: CONF 1
7. Acceleration to Green Dot speed
8. Climb to QNH 15000 ft

The procedure will start at SAA VOR as missed approach point, then climb to 8000 ft, at D4 SAA right turn to SAA VOR, then intercept R359 SAA to NIBAL waypoint. In this calculation type, the runway tab will be filled by SAA VOR information. This procedure will be tranlated into several ground track steps and its first step screenshot are shown below. 

1. Fly heading 179 deg, portion end type: Turn to new Navaid SAA at DME 4 SAA, bank angle 20 deg.
2. Fly direct to Navaid SAA, portion end type: Turn to new Navaid NIBAL at DME 1.7 SAA, bank angle -15 deg.
3. Fly direct to Navaid NIBAL, portion end type: at Navaid.

Note: we need to key in coordinates of SAA and NIBAL in Navaids definition as shown in screenshoot below.

The WinPEP result is shown below. The altitude of 8000 ft is reached at point DME 4 SAA as shown in the second picture.

I used the result from WinPEP to be analyzed in my EOSID applicaiton inside MATLAB. The resulted 2D and 3D view of terrain and flight procedure are shown below.

The significant terrains along the procedure is shown in graph and table below after considering the loss of gradient during a turn. The most significat terrain is the one around distance of 3.2 km with climb gradient of 0.75%. Since the most significant terrain is below 2.5% climb gradient, this missed approach procedure does not required a special one engine out procedure.

The visualization of this procedure can be viewed in Google earth by downloading this kml files (you can use the same aircrat model as in SLTJ EOSID sample). Some screenshots of flight are shown below. The green circles are flight path markers. 

If you have feedback or something to discuss, please do not hesitate to contact me by email! 

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