P.O. BOX 790490 • SAN ANTONIO, TEXAS 78279-0490 • (210) 824-9421 

### SUBJECT: REVISION TO SA26-AT DASH TWO AFM

TO: ALL OPERATORS AND AFM MANAGERS OF THE SA26-AT DASH TWO

1. Attached is the Revision dated May 14, 2015 to your AFM.

2. File this transmittal letter in your AFM binder behind the Title Page.

3. Insert Revision 9 Log of Effective Pages behind the Transmittal Page.

4. Replace Section III Index with the revised Index.

5. Replace Section III pages III-1 thru III-8 with revised pages.Section III – INDEX 

# MERLIN MODEL SA-26AT

Section III EMERGENCY OPERATING INDEX
PROCEDURES

Revised: May 14, 2015 Page

SINGLE ENGINE PROCEDURES ...........................................III-1

SECURING AN INOPERATIVE ENGINE – CRUISE

OPERATION ..........................................................................III-1

ENGINE FAILURE DURING TAKEOFF ...................................III-1
Prior to Liftoff Speed ..........................................................III-1

After Liftoff with Insuf fi cient Runway to Stop ......................III-1
Single Engine Landing .......................................................III-2 DOUBLE ENGINE FAILURE (RESTARTS/RELIGHTS
UNSUCCESSFUL) ................................................................III-2

ENGINE - PROPELLER UNCOUPLING ..................................III-3

AIRSTART PROCEDURES ......................................................III-3

ABORTED AIRSTART ..............................................................III-4

ENGINE FIRE – FLIGHT ..........................................................III-4

ENGINE FIRE – GROUND .......................................................III-5

LANDING GEAR MANUAL EXTENSION .................................III-5

SMOKE.....................................................................................III-5

CABIN PRESSURIZATION ......................................................III-6

EMERGENCY EXIT .................................................................III-7

FLAP MOTOR FAILURE ..........................................................III-7

ALTERNATE STATIC AIR SOURCE ........................................III-7

FUEL DUMPING ......................................................................III-7

ELECTRICAL SYSTEM PROCEDURES .................................III-7

BUS FAILURE ..........................................................................III-7

ELECTRICAL SMOKE .............................................................III-8

PROPELLER ANTI-ICE SYSTEM MALFUNCTION .................III-8Section III – INDEX 

# MERLIN MODEL SA-26AT

Section III EMERGENCY OPERATING INDEX
PROCEDURES

Revised: May 14, 2015 Page

SINGLE ENGINE PROCEDURES ...........................................III-1

SECURING AN INOPERATIVE ENGINE – CRUISE

OPERATION ..........................................................................III-1

ENGINE FAILURE DURING TAKEOFF ...................................III-1
Prior to Liftoff Speed ..........................................................III-1

After Liftoff with Insuf fi cient Runway to Stop ......................III-1
Single Engine Landing .......................................................III-2 DOUBLE ENGINE FAILURE (RESTARTS/RELIGHTS
UNSUCCESSFUL) ................................................................III-2

ENGINE - PROPELLER UNCOUPLING ..................................III-3

AIRSTART PROCEDURES ......................................................III-3

ABORTED AIRSTART ..............................................................III-4

ENGINE FIRE – FLIGHT ..........................................................III-4

ENGINE FIRE – GROUND .......................................................III-5

LANDING GEAR MANUAL EXTENSION .................................III-5

SMOKE.....................................................................................III-5

CABIN PRESSURIZATION ......................................................III-6

EMERGENCY EXIT .................................................................III-7

FLAP MOTOR FAILURE ..........................................................III-7

ALTERNATE STATIC AIR SOURCE ........................................III-7

FUEL DUMPING ......................................................................III-7

ELECTRICAL SYSTEM PROCEDURES .................................III-7

BUS FAILURE ..........................................................................III-7

ELECTRICAL SMOKE .............................................................III-8

PROPELLER ANTI-ICE SYSTEM MALFUNCTION .................III-8FAA APPROVED: JUNE 12, 1968 III-1 

# MERLIN MODEL SA-26AT

Section III EMERGENCY OPERATING PROCEDURES

SINGLE ENGINE PROCEDURES

WARNING

IN THE EVENT OF AN ENGINE FAILURE OR POWER LOSS,THE ENGINE NEGATIVE TORQUE SYSTEM (NTS) ONLY PROVIDES PARTIAL DRAG REDUCTION BUT NOT TO THE EXTENT

OF A FULLY FEATHERED PROPELLER.

PILOT MUST TAKE ACTION TO FULLY FEATHER THE PROPELLER (ON THE AFFECTED ENGINE) TO REDUCE PROPELLER

DRAG.

SECURING AN INOPERATIVE ENGINE-CRUISE OPERATION

1. Determine inoperative engine by torque or T.I.T. 2. Secure inoperative engine as follows: Engine Stop and Feather ............... PULL

Generator ........................................ OFF Boost Pump .................................... OFF
Fuel Shut-off Valve ......................... CLOSED 3. Adjust Power on Operating Engine as Necessary

4. Retrim
5. Oil Shutter ........................................... AS NECESSARY 6. Load on Remaining Generator .......... 200 AMP MAX. 7. Propeller Synchronizer ...................... LANDING 8. Land as soon as possible, observing landing weight limita-tions. Balance fuel prior to landing by opening cross fl ow valve.

ENGINE FAILURE DURING TAKEOFF

PRIOR TO LIFTOFF SPEED, V LOF

1. Power levers ....................................... GROUND IDLE
2. Brakes ................................................. AS NECESSARY 3. Inoperative engine .............................. SECURE

AFTER LIFTOFF WITH INSUFFICIENT RUNWAY TO STOP

1. Gear ..................................................... UP 2. Operating Engine ............................... TAKEOFF RATING

Revised: May 14, 2015FAA APPROVED: JUNE 12, 1968 III-2 

# MERLIN MODEL SA-26AT

Section III EMERGENCY OPERATING PROCEDURES

AFTER LIFTOFF WITH INSUFFICIENT RUNWAY TO STOP (Continued)

3. Inoperative engine .............................. SECURE 4. Best Rate of Climb Airspeed ............. 110 KNOTS 5. Land as soon as possible 6. If above landing weight, dump fuel.

SINGLE ENGINE LANDING

WARNING

IN THE EVENT OF AN ENGINE FAILURE OR POWER LOSS,THE ENGINE NEGATIVE TORQUE SYSTEM (NTS) ONLY PROVIDES PARTIAL DRAG REDUCTION BUT NOT TO THE EXTENT

OF A FULLY FEATHERED PROPELLER.

PILOT MUST TAKE ACTION TO FULLY FEATHER THE PROPELLER (ON THE AFFECTED ENGINE) TO REDUCE PROPELLER

DRAG.

1. Do not extend fl aps until runway is assured. 2. Do not use reverse thrust on operating engine.

3. Reduce nonessential electrical loads.

DOUBLE ENGINE FAILURE (RESTARTS/RELIGHTS UNSUCCESSFUL)

1. AIRSPEED ........................................... MAINTAIN BEST
GLIDE AIRSPEED

GLIDE AIRSPEED WEIGHT (POUNDS) 10,000 9,000 8,000 AIRSPEED (KIAS) 130 120 115

NOTE

Best Glide airspeed is approximately 1.4 V/V S

.

2. GEAR ................................................... UP
3. FLAPS .................................................. UP

Revised: May 14, 2015FAA APPROVED: JUNE 12, 1968 III-3 

# MERLIN MODEL SA-26AT

Section III EMERGENCY OPERATING PROCEDURES

DOUBLE ENGINE FAILURE (RESTARTS/RELIGHTS UNSUCCESSFUL) (Continued)

4. Complete Securing an Inoperative Engine – Cruise Operation
Checklist. Plan for emergency gear extension and a zero fl ap landing. If altitude above ground level (AGL) permits, unfeathering one engine may provide suf fi cient hydraulic pressure to operate the fl aps.

ENGINE - PROPELLER UNCOUPLING

WARNING

IN THE EVENT OF ENGINE FAILURE IN CONJUNCTION WITH ENGINE UNCOUPLING, REDUCE WINDMILLING DRAG AS
FOLLOWS:

IF AN UNCOUPLING EVENT OCCURS WHERE THE ENGINE IS
OPERATING AND THE PROPELLER IS STOPPED AND FEATHERED, RETARDING THE POWER LEVER TO FLIGHT IDLE MAY
RESULT IN UNFEATHERING AND SUBSEQUENT ROTATION OF THE PROPELLER. IF THIS OCCURS, ADVANCE THE POWER
LEVER TO MAXIMUM POWER POSITION.

IN THE EVENT OF AN ENGINE WITH AN NTS AND/OR FEATHER VALVE MALFUNCTION, SETTING THE ASSOCIATED POWER LEVERS FULL FORWARD WILL DRIVE THE PROPELLER
BLADES TOWARD THE FEATHER POSITION YIELDING A

LOWER WINDMILLING PROPELLER DRAG AND PROPELLER
SHAFT SPEED.

AIRSTART PROCEDURES

If an engine has been secured because of an obvious failure, as indicated by the engine instruments or excessive vibration,
an airstart is not recommended.

1. Speed Levers .........................................................MATCHED 2. Power Levers .........................................................MATCHED 3. Altitude 20,000' or LESS 4. Airspeed AS DESIRED 5. Engine Stop and Feather ......................................FORWARD

Revised: May 14, 2015FAA APPROVED: JUNE 12, 1968 III-4 

# MERLIN MODEL SA-26AT

Section III EMERGENCY OPERATING PROCEDURES

AIRSTART PROCEDURES (Continued)

..........................................

6. Fuel Boost Pump ...............................................................ON 7. Fuel Shutoff Valve .........................................................OPEN 8. Start Button ............................................. PRESS AND HOLD 9. Observe Propeller unfeathering
10. RPM 10–20% 11. Observe Lightoff by T.I.T. & Fuel Flow 12. Start Buttons: RELEASE WHEN T.I.T. STARTS TO RISE MAY BE USED AS PRIMER AS REQUIRED 13. Monitor rpm, T.I.T., until stabilization is attained 14. Generator .........................................................................ON 15. Fuel Pressure, Oil Pressure .............................GREEN ARC 16. Oil Shutter ................................................. AS NECESSARY

ABORTED AIRSTART

If lightoff does not occur by 25% rpm or T.I.T. start limit of 788 degrees C is reached below 50% rpm, abort start.

1. Stop Button .................................................................PRESS 2. Allow engine to windmill for one minute if feasible 3. Engine Stop and Feather ............................................... PULL

ENGINE FIRE – FLIGHT

WARNING

IN THE EVENT OF AN ENGINE FAILURE OR POWER LOSS,THE ENGINE NEGATIVE TORQUE SYSTEM (NTS) ONLY PROVIDES PARTIAL DRAG REDUCTION BUT NOT TO THE EXTENT

OF A FULLY FEATHERED PROPELLER.

PILOT MUST TAKE ACTION TO FULLY FEATHER THE PROPELLER (ON THE AFFECTED ENGINE) TO REDUCE PROPELLER

DRAG.

1. Engine Stop & Feather ................................................... PULL 2. Fuel Shutoff Valve .................................................... CLOSED 3. Fire Extinguisher .....................................................ACTUATE 4. Follow single engine procedures

Revised: May 14, 2015FAA APPROVED: JUNE 12, 1968 III-5 

# MERLIN MODEL SA-26AT

Section III EMERGENCY OPERATING PROCEDURES

ENGINE FIRE – FLIGHT (Continued)

WARNING

DO NOT DUMP FUEL WITH AN ENGINE FIRE. MAKE AN OVERWEIGHT LANDING IF NECESSARY.

ENGINE FIRE – GROUND

1. Engine Stop and Feather ................... PULL 2. Stop Button ......................................... PRESS
3. Fuel Shutoff Valve .............................. CLOSE 4. Fire Extinguisher ................................ ACTUATE
5. Starter Test Switch ............................. ENGAGE

6. Motor Engine by Starter Test Switch until engine is cleared.

LANDING GEAR MANUAL EXTENSION:

1. Landing gear control circuit Breaker ..... PULLED 2. Airspeed ............................................... 137K MAX.
3. Gear Handle ......................................... DOWN 4. Landing Gear Clutch Lever .................. UP 5. Emergency Hand Pump Lever ............. SLIDE INBOARD 6. Discontinue pumping when gear indicators show "DOWN" or forces noticeably increase. 7. Do not attempt to retract landing gear after extending by the emergency system.

SMOKE

1. Initiate Descent and Use Oxygen 2. Set cabin altitude controller to 10,000 feet and Rate control

to maximum
3. Determine source of Smoke:A. ELECTRICAL SMOKE – See Electrical Emergency Pro-cedures. B. BLEED AIR SMOKE – Retard power lever on left engine to FLT. IDLE. If smoke stops, secure left engine. If smoke continues, place left engine power lever forward and right engine power lever to FLT. IDLE. If smoke continues, place bleedair switch to SHUTOFF position.

Revised: May 14, 2015FAA APPROVED: JUNE 12, 1968 III-6 

# MERLIN MODEL SA-26AT

Section III EMERGENCY OPERATING PROCEDURES

SMOKE (Continued)

4. When below 12,000 feet or all occupants are using oxygen, additional fresh air may be obtained by placing the pressurization switch in the DUMP position. This provides ram air supply to the cabin.

CABIN PRESSURIZATION:

If the cabin altitude warning light comes on, the cabin altitude is above 11,500. Check differential pressure and controller settings.If differential pressure is less than desired, go to "MANUAL" operation. If the desired differential cannot be regained then an excessive leak is indicated and it will be necessary to descend or use oxygen.

If the cabin differential pressure exceeds the limit, the out fl ow valve controller has failed. Select "MANUAL" position on the cabin pressure selector and regulate pressure manually. If manual control is ineffective, the fl ight can be continued on the safety valve setting. Prior to landing, the cabin pressure differential must be relieved by use of the manual control or this alternate procedure.

1. Altitude ................................................. below 12,000 ft.
2. Bleedair Shutoff Valve .......................... SHUTOFF3. Allow Cabin Pressure to Leak off Until Less Than 1 psi differential Pressure is Shown. 4. Cabin Pressure Dump Valve ................ DUMP
5. Bleedair Shutoff Valve .......................... NORMAL 6. Proceed at Low Altitude to Airport

A third procedure can be used, that of dumping the cabin pressure by use of the dump valve. This method is sudden and uncomfortable on passengers, and should be used only if other
methods fail.

If cabin pressure is dumped for any reason while at high

altitude.

1. Power Levers ....................................... FLIGHT IDLE 2. Airspeed ............................................... V MO 3. Use Oxygen 4. Descend to 12,000 feet or below

Revised: May 14, 2015FAA APPROVED: JUNE 12, 1968 III-7 

# MERLIN MODEL SA-26AT

Section III EMERGENCY OPERATING PROCEDURES

EMERGENCY EXIT:

1. Pull Handles Together Then Inward

FLAP MOTOR FAILURE

A Flaps Up Landing will be necessary. Obtain stall speed and approach speed from Figure IV-E.

ALTERNATE STATIC AIR SOURCE:

1. Select Alternate on static source selector valve. Pilot'sstatic instruments will then be vented to the nose compartment. Alternate source position error is less than 4.35 knots throughout the operating range.

FUEL DUMPING:

1. Airspeed ............................................... AS DESIRED 2. Flaps ..................................................... UP 3. Fuel Dump Switches ............................ OPEN

NOTE: Fuel Flow Rate is 230#/Min when dumping from both chutes. After dumping desired amount, close fuel dump switches. All but 55 gals. in each tank can be dumped. Total dumping capacity is 1849 lbs. of fuel, starting with full tanks. If one dump chute failsto open, continue to dump from operative chute and open crossfl ow valve. Close dump valves before landing. Observe 50 Gal. Asymmetric Fuel Limits.

ELECTRICAL SYSTEM PROCEDURES

BUS FAILURE – If one of the essential bus breakers trips due to

a massive overload on that bus, turn generator off for same side and maintain not more than 200 AMPS continuous load on remaining generator.

FAA APPROVED: May 14, 2015FAA APPROVED: JUNE 12, 1968 III-8 

# MERLIN MODEL SA-26AT

Section III EMERGENCY OPERATING PROCEDURES

BUS FAILURE - (Continued)

NOTE

Single generator operation will automatically prevent the airconditioning compressor from functioning although Auto or Manual positioning of the Bleed air Mixing Valve will continue to be operative.

To disable either essential bus, the bus tie switch and generator must be turned off for that side. If either the nonessential or air conditioning bus breaker trips due to overload, do not attempt to restore power to these busses.

ELECTRICAL SMOKE – If electrical smoke is detected in one

of the essential busses, turn off the bus tie switch and generator for that side. If smoke subsides, pull all the circuit breakers on the affected bus and then turn generator ON. If smoke does not return, then place bus tie switch ON. This action will restore full generator output to the remaining busses. If the smoke emanates from the nonessential bus, turn off the nonessential bus tie switch. If smoke comes from air conditioner bus, pull air conditioning control circuit breaker. If the main circuit breakers for any of these busses trip, do not attempt to reset and follow "BUS FAILURE" procedures.

PROPELLER ANTI-ICE SYSTEM MALFUNCTION

If the propeller boots malfunction as indicated by erratic, low, high, or no load conditions on the loadmeter, the system may bedeactivated by pulling the appropriate circuit breaker for the propeller boot system. If under actual icing conditions, operation may be continued as required for safety of fl ight.

FAA APPROVED: May 14, 2015