Isn't situational awareness a good enough reason ?
Now let me ask some questions.
Does it cause you or anyone else any discomfort ?
is it likely to cause injury ?
Is it dangerous ?
Does it waste fuel ?
Does it waste electrical power to operate ?
Does it significantly reduce the service life of the component ?
Does it significantly increase unnecessary wear and tear ?
Does it affect the engine start or any other aircraft system in any way ?
Does it affect aircraft pushback ?
Does it cause damage ?
Does it waste time and delay departure ?
Does it increase workload ?
Does it waste energy ?
Does it affect anything that you or anyone else is doing ?
Does it affect any of the flight instruments on your side ?
Are you even aware the other pilot does it unless you look across ? (shouldn't you be monitoring the engine start and not small insignificant things that the other pilot is or is not doing ?)
Does it affect passenger comfort ?
Does it place increased risk and danger on the operation ?
Does Airbus specifically say not to do it ?
Is it beyond aircraft limits ?
Is it not what is was it designed for ? (to monitor timing as required)
Does it have any affect on anything else in the aircraft ?
Is the chrono being used usefully for anything else ?
Is the chrono timer specifically limited or designed for another particular function ?
Does the chrono distract anyone from doing their job ?
Is the chrono button difficult to operate ? Does it require special skill ?
Is it possible to make a dangerous error or increase any risk to safety whilst you operate it ? (even if you make an error)
Is it likely to increase any errors to be made ?
Is it not worth the risk (if there is any risk ?) to operate ?
Is the chrono timer out of normal view ?
Is the chrono button likely to get confused with another switch or button ? (that might cause something you don't want)
Is it a breach of the law or company policy ?
Is it noisy to operate ?
Does it affect the air temperature ?
Does it cost money to operate ?
Does it affect company revenue and profit ?
Does it modify the aircraft appearance ?
Does it affect the company image ?
Does it increase operating cost ?
Does it pollute the environment ?
Does it affect air traffic control ?
Does it affect cargo and baggage ?
Does it affect the toilet or galley ?
Is it offensive to anyone ?
Is it a security hazard ?
Is it politically incorrect, racist, sexist or discriminatory to operate ?
Then why does such a small insignificant thing really
bother some people so much ?
