Example:
WRITE: Each engine has a CSD to operate the AC generator at a constant speed of 8000 rpm. Differences in engine rpm and generator load have no effect on this constant speed.
NOT: A CSD per engine drives the AC generators at 8000 rpm constant regardless of engine rpm or generator load difference.
Section 7 - Warnings and Cautions
Summary of the Rules
RULE: 7.1 Start a warning or a caution with a simple and clear command.
RULE: 7.2 Be specific in a warning or caution.
RULE: 7.3 If necessary, add a brief explanation to a warning or a caution to give a clear idea of the possible risk.
RULE: 7.4 Identify your command correctly as a warning or caution.
RULE: 7.5 If a condition is necessary before the technician continues, put the condition first in the warning or caution.
Why Do We Have Warnings and Cautions?
Warnings and cautions tell a technician that parts of the procedures can be dangerous and / or cause damage. A warning means that injury or death is possible if the instructions are not obeyed. A caution means that damage to equipment is possible.
Examples:
UWARNINGU: BEFORE YOU FILL THE LIQUID OXYGEN SYSTEM, PUT ON PROTECTIVE CLOTHING. LIQUID OXYGEN IS DANGEROUS.
UCAUTIONU: BEFORE YOU OPERATE THE GROUND TEST UNIT, MAKE SURE THE PRESSURE REGULATOR IS AT ZERO. THIS WILL HELP PREVENT DAMAGE TO THE UNIT.
How to Write Warnings and Cautions
RULE: 7.1 Start a warning or a caution with a simple and clear command.
Warnings and cautions must start with a simple and clear command. This command tells the technicians what they must do to avoid the danger and / or damage. Do not hide this command as a general comment with other background information. Start with the command, and then give the supporting information.
Example:
WRITE: UWARNINGU: DO NOT GET THE ENGINE OIL ON YOUR SKIN. THE OIL IS POISONOUS. IT CAN GO THROUGH YOUR SKIN AND INTO YOUR BODY.
NOT: UWARNINGU: THE SYNTHETIC LUBRICATING OIL USED IN THIS ENGINE CONTAINS ADDITIVES WHICH, IF ALLOWED TO COME INTO CONTACT WITH THE SKIN FOR PROLONGED PERIODS, CAN BE TOXIC THROUGH ABSORPTION.
RULE: 7.2 Be specific in a warning or caution.
You must tell the users exactly what they must do and what can happen, to get their attention immediately. Do not write the warning or caution as a general comment.
Example:
WRITE: UWARNINGU: MAKE SURE THE THRUST-REVERSER ISOLATION VALVE IS CLOSED. IF THIS VALVE IS OPEN, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY. THIS CAN CAUSE INJURY TO PERSONNEL AND / OR DAMAGE TO EQUIPMENT.
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