737 fire handle - reset in flight?

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Fire detection 747-287B (JT9D-7Q)

Boeing AOM page 12.20.01

ENGINE NACELLE OVERHEAT
A nacelle temperature indication between 2.5 and 7.0 (amber range) should be monitored closely. NOTE A maintenance log entry should be made if nacelle temperatures stabilize in the anmber range or of A and B indicators do not agree within 2.5 units in the amber range.

IF NACELLE TEMPERATURE INDICATION IS APPROACHING 7.0 (RED):
Bleed Air Valve Switch... CLOSE
- Check VALVE CLOSE light illuminated.
Fuel Heat Switch... CLOSE
- Check OPEN light extinguished.
Nacelle Anti-Ice Switch... OFF
- Check VALVE OPEN light extinguished.
Engine Trust Lever... RETARD TO IDLE
- If nacelle temperature indication continue to rise, shut down engine.
See Chapter 2. INFLIGHT ENG FAILURE/SHUTDOWN

NACELLE FIRE DETECTION/FAULT LIGHT ILLUMINATED
Nacelle Temperature Indicators... CHECK.
- Identify engine and detector indicating in "red band"
Nacelle Fire Detector Switch... POSITION TO UNAFFECTED DETECTOR
- FIRE DETECTION and FAULT lights should extinguish.
Nacelle FIRE/FAULT Test Switch (Unaffected Detector) POS TO FIRE then FAULT.
- Position Test Switch of unaffected detector switch FIRE then to FAULT and check nacelle temperature indicator in the "red band" for FIRE TEST and for FAULT TEST. Fire warnings should occur in both positions.
- If unaffected detector test is normal, leave Detector Switch as position and continue normal engine operation.
- If unaffected detector does not test normally, position Detector Switch to the detector indicating in the "red band" and accomplish ENG FIRE SEVERE DAMAGE/SEPARATION checklist (Chapter 2 AOM or QRH)

Boeing AOM Page 12.50.01- 747-200/300 JT9D-7Q
Fire Protection Supplementary Information
Engines
Two engine fire detector systems are installed for each engine. Each system provides both relative temperature level indication and fault or fire detection capability and may be operated independently of the other.
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For normal operations, both detector systems are required to indicate a fire warning. A fault in both detector systems will result in a fire warning and during single detector system operation, either a fault or a fire will result in a fire warning.
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If an electrical short occurs, the affected nacelle temperature indicator will be locked in the "red band" and the necelle fire detector fault lights will illuminate. Selecting the operative detector system will extinguish the fault lights.
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A detector open will NOT affect the operation of the detector system but will be evidenced by NO response to the fire test.
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The fire detector system will respond to the following indications and warnings:
- Master FIRE warning lights will illuminate.
- Fire warning bell will sound.
- Engine FIRE switch will illuminate and remein illuminated as long as fire exists.
- Nacelle temperature indicator will be in "red band" and remein as long as fire exists.
NOTE
The fire warning will be locked on if an electrical short occurs during a fire. Selecting the operative detector will allow the warning indication to cease when the fire condition has passed.
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Each engine has two fire extinguishing bottles which may be discharged separately into the nacelle area. Two nacelle discharge indicators, one for each extinguisher bottle, are located on the RH side of the engine strut. An indicator, when not intact, indicates that the associated bottle has been thermally discharged as well.
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(end of Boeing AOM text)

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