O.M Part C
Chapter 4
Route & aerodromes instructions and
Escape Route
information
4/1
Table of Content
No
4.1
4.2
Item
Page
Introduction
4.2
4.1.1 Depressurization Escape Routes
4.2
4.1.2 Assumptions
4.3
Route Specific Procedure
4.5
4.2.1 Decompression Egypt / EVN / Egypt
4.5
4.2.2 Decompression Middle East to Kabul to Middle East.
4.7
4.2.3 Decompression via north of Kabul
4.9
4.2.4 Decompression ALPS
4.10
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4.1 Introduction
4.1.1 Depressurization Escape Routes

Certain destinations will have routes that overfly mountainous
regions. When the GRID MORA is higher than FL100, then a standard
emergency descent may not be possible due to obstacle clearance. In
these cases the “Escape Route” will be published for the critical route
segments.

Loss of pressurization requires that the aircraft is flown at an altitude
that provides oxygen for crew and passengers. The aircraft has
systems in place that will provide oxygen to passengers and crew
while the aircraft is descending to this altitude.

When terrain clearance is not a factor the “normal” emergency
descent can be flown down to FL100. However, when terrain
clearance is a factor, the descent profile and route to be flown must
provide terrain clearance and comply with regulated oxygen
requirements.

In order for the systems to provide adequate protection, the aircraft
must be flown in accordance to (or below) the following profile after a
depressurization (refer to FCOM). This profile is applicable to the
B737-500/800 aircraft equipped with 12 minutes of passengers’
oxygen supply.

This profile by itself does not provide terrain clearance. For some of
AMC routes this profile could put the aircraft below MSA. Therefore
“Escape Routes” have been established for certain routes. Escape
Routes have an escape start point on the normal route, dependant on
the terrain. One company route may have multiple escape start points
and therefore multiple escape routes.
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4.1.2 Assumptions
The following assumptions apply:
All obstacles located within 5 NM of either side of the route centerline

have been considered, based on a 10 NM corridor survey.

All obstacles are cleared by min 2000 ft.

Flight after depressurization is performed at MMO/VMO
(0.82/340kt).

Temperature is ISA, no wind.

In case of in-flight turn back, 1.5 minutes are lost for the turn and 3
nm radius of turn.
Emergency Descent in case of rapid depressurization procedure:
Start emergency descent to FL 180 with max flying time 11MINs from

the start of descent.
After 11MINs are over start descent to FL 140 with max flying time 30

MINs from level off
After 30 MINs at FL 140 descent to FL 100

For B738
Passenger Oxygen requirement:
Maximum altitude oxygen based on 12 MINs comical system
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For B735
Passenger Oxygen requirement:
Maximum altitude oxygen based on 12 MINs comical system
For A320-231
Passenger Oxygen requirement:
Maximum altitude oxygen based on 15 MINs comical system
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4.2 Route Specific Procedure
4.2.1 Decompression Egypt / EVN / Egypt
Route via Syria or Nicosia
Option 1:
Between EVKIT to GAZ via UW84/UW74
 LTAF via EVKIT UW84 – ADA
 LTDA via TARSU ADKAR – HTY
 LTAJ via same route
Option 2:
Between GAZ to EZS via UW701
 LTAJ reversed route
 LTCS via UW716 SONSU UW103 BADEM
 LTCS via ASKER DIGIL EKTEL
 LTCA via same route
Option 3:
Between EZS to ERZ via UW701
 LTCA reversed route
 LTCE via same route
Option 4:
Between ERZ to UDYZ via UN161
 LTCE reversed route
 UDYZ same route
Procedure
Flight Phase
Descent to
FL180
CRZ –
FL180
Descent
to FL140
CRZ –
FL140
Descent to
FL100
Speed
MMO/VMO
VMO
VMO
VMO
VMO
Time
6 Minutes*
7 Minutes**
9 Minutes ***
30 Minutes
*B738
**B735
***A320
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Via Nicosia
Via Syria and Nicosia
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4.2.2 Decompression Middle East to Kabul to Middle East
4.2.2.1 Route via Middle East to Kabul
Critical route (PEKES Z627 BUDBO Z627 OGOGO PAROD A453 PATOX)
Option 1:
Decompression before
LUDAX
Option 2:
Return (BND/OIKB) via Z627 PEKES A453
BND
Return to (DOH/OTHH or DXB/OMDB) as
per reserve routing of operational flight plan.
Decompression between
LUDAX to PAROD
Option 1:
Decompression after
PAROD
Option 1:
Continue to the destination (KBL/OAKB) or
Option 2:
Proceed to (PEW/OPPS) via direct routing
Return to (ACZ/OIZB) via PAROD A453
OGOGO Z627 LUDAX DCT ZAL
4.2.2.2 Route via Kabul to Middle East
Critical route (PATOX A453 PAROD OGOGO Z627 BUDBO Z627 PEKES)
Decompression before
PAROD
Option 1:
Return to the departure (KBL/OAKB) or
Option 2:
Proceed to (PEW/OPPS) via direct routing
Decompression between
PAROD to LUDAX
Option 1:
Proceed to (ACZ/OIZB) via PAROD A453
Decompression after
LUDAX
Option 1:
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OGOGO Z627 LUDAX DCT ZAL
Proceed to (BND/OIKB) via Z627 PEKES
A453 BND
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Flight Phase
Descent to
FL180
CRZ –
FL180
Descent
to FL140
CRZ –
FL140
Descent
to FL100
Speed
MMO/VMO
VMO
VMO
VMO
VMO
Time
6 Minutes*
7 Minutes**
9 Minutes ***
30 Minutes
*B738 /**B735/ ***A320
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4.2.3 Decompression via North of Kabul
Critical route (AMDAR A454 TAPIS )
Decompression before
DOSHI
Option 1:
Decompression after
DOSHI
Option 1:
Return (TMJ/UTST) via A454 to AMDAR
DCT to TRZ
Continue to the destination (KBL/OAKB) or
Option 2:
Proceed to (PEW/OPPS) via direct routing
Flight Phase
Descent to
FL180
CRZ –
FL180
Descent
to FL140
CRZ –
FL140
Descent
to FL100
Speed
MMO/VMO
VMO
VMO
VMO
VMO
Time
6 Minutes*
7 Minutes**
9 Minutes ***
30 Minutes
*B738/ **B735/ ***A320
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4.2.4 Decompression ALPS
Decompression: North of N47° between E11° and E16°
Procedure
 Proceed/Return to the North using emergency
descent vertical profile for 13 min oxygen system.
 Proceed to the nearest suitable airport
Decompression: South of N47º between E11° and E16°
Procedure
 Proceed/Return to the South using emergency
descent vertical profile for 13 min oxygen system.
 Proceed to the nearest suitable airport.
Decompression: North of N46.5° between E9.5° and E11°
 Proceed/Return to the North using emergency
Procedure
descent vertical profile for 13 min oxygen system.
 Proceed to the nearest suitable airport
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Decompression: South of N46.5° between E9.5° and E11°
Procedure
 Proceed/Return to the South using emergency
descent vertical profile for 13 min oxygen system.
 Proceed to the nearest suitable airport.
Decompression: North of N46° between E7° and E9.5°
Procedure
 Proceed/Return to the North using emergency
descent vertical profile for 13 min oxygen system.
 Proceed to the nearest suitable airport.
Decompression: East of E07° between N44° and N46°
Procedure
 Proceed/Return to the South East using emergency
descent vertical profile for 13 min oxygen system.
 Proceed to the nearest suitable airport.
Decompression: West of E07°
Procedure
 Proceed/Return to the West using emergency
descent vertical profile for 13 min oxygen system.
 Proceed to the nearest suitable airport.
Flight Phase
Descent to
FL180
CRZ –
FL180
Descent
to FL140
CRZ –
FL140
Descent
to FL100
Speed
MMO/VMO
VMO
VMO
VMO
VMO
Time
6 Minutes*
7 Minutes**
9 Minutes ***
30 Minutes
*B738/ **B735/ ***A320
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