Engine Inoperative Cruise/Driftdown
Performance of a non-normal checklist or sudden engine failure may lead to the
requirement to perform a single engine driftdown. If an engine failure occurs while at cruise altitude, it may be necessary to descend. The autothrottle should be disconnected and the thrust manually set to CON. On the FMC CRZ page, select the ENG OUT prompt, followed by the prompt corresponding to the failed engine. This displays MOD ENG OUT CRZ (ENG OUT CRZ for FMC U10.3 and later) and the FMC calculates engine out target speed and maximum engine out altitude at the current gross weight. The fields are updated as fuel is burned.
737-300 - 737-500 Note: On FMC updates prior to 10.0, do not execute the page if VNAV is
required for any arrival procedures. If any ENG OUT page is executed, the
FMC will not transition to descent. On FMC updates 10.0 and later, the
ENG OUT page cannot be executed.
Set the MAX altitude in the MCP altitude window and the engine out target airspeed in the MCP IAS window. Allow airspeed to slow to engine out speed then engage LVL CHG. If the engine out target airspeed and maximum continuous thrust (MCT) are maintained, the airplane levels off above the original MAX altitude. However, the updated MAX altitude is displayed on the ENG OUT CRZ page. After viewing engine out data, select the ERASE prompt to return to the active CRZ page. With the MOD ENG OUT CRZ page selected, no other FMC data pages can be executed.
After level off at the target altitude, maintain MCT and allow the airplane to accelerate to the single engine long range cruise speed. Maintain this speed with manual thrust adjustments. Entering the new cruise altitude and airspeed on the ECON CRZ page updates the ETAs and Top of Descent predictions. Refer to Engine Out Familiarization, chapter 7, for trim techniques.
. Select ENG OUT CRZ
. Set engine out altitude and airspeed on MCP Engine
. Slow to ENG OUT airspeed failure
. Select LVL CHG
.
.
. Non-normal checklist
. Disconnect
autothrottle
.
Select CON
.
Notify ATC
.
thrust in FMC
.
Initiate turn
.
Manually set
. Maintain CON
with HDG SEL
limit thrust
(if required) . Accelerate to single engine long range cruise speed
. Determine course of action
Note: If the airplane is at or below maximum ENG OUT altitude when an engine
becomes inoperative, select the MOD ENG OUT CRZ (ENG OUT CRZ
for FMC U10.3 and later). Maintain engine out cruise speed using manual
thrust adjustments.
High Altitude High Speed Flight
The airplane exhibits excellent stability throughout the high altitude / high Mach range. Mach buffet is not normally encountered at high Mach cruise. The airplane does not have a Mach tuck tendency.
With Mach trim inoperative, the airplane exhibits a slight nose down trim change when accelerating to speeds approaching MMO, however, control force changes are light and easily managed. When the Mach trim system is operative, the nose down trim change is nearly imperceptible except by referencing the control column position.
As speed nears MMO, drag increases rapidly. At high weights, sufficient thrust may not be available to accelerate to MMO in level flight at normal cruising altitudes.
ETOPS
Extended Range Operation with Two Engine Airplanes (ETOPS) are those flights which include points at a flying distance greater than one hour (in still air) single engine cruise speed from an adequate airport. Improved technology and the increased reliability of two engine airplanes has prompted a re-examination of the rules governing their flights over oceans or desolate areas.
Copyright . The Boeing Company. See title page for details.
4.14 FCT 737 (TM) October 31, 2006
ETOPS Requirements and Approval
Operators conducting ETOPS are required to comply with the provisions of FAA Advisory Circular 120-42A or other applicable governing regulations. An operator must have an ETOPS configured airplane, and approved flight operations and maintenance programs in place to support ETOPS operations.
The Minimum Equipment List (MEL) and the Dispatch Deviations Guide (DDG)
include dispatch relief levels appropriate to ETOPS. The operator ensures that the ETOPS airplane is in compliance with the requirements of the appropriate Boeing Configuration, Maintenance and Procedures (CMP) documents. The operator's maintenance department must develop programs which monitor and report reliability of the engines, airframe and components. The Minimum Equipment List (MEL) and the Dispatch Deviations Guide (DDG) have been expanded to address the improved redundancy levels and the additional equipment unique to ETOPS configured airplanes.
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