91.205 Question

[Benji86]

Well I was studying 91.205 for the CFI, and a question mark popped in my head concerning the requirement for having a magnetic direction indicator in the aircraft. I was a little fuzzy as to the definition of this instrument. So I looked up the definition in the FARs and couldn't find anything. So how should I interpret this?
Does this mean that there must be a working magnetic compass in the airplane, or a working heading indicator or both. My first thought is that there must be at least a magnetic compass in the airplane.
Any thoughts on how to interpret this?

[moxiepilot]

Originally Posted by Benji86

Well I was studying 91.205 for the CFI, and a question mark popped in my head concerning the requirement for having a magnetic direction indicator in the aircraft. I was a little fuzzy as to the definition of this instrument. So I looked up the definition in the FARs and couldn't find anything. So how should I interpret this?

Does this mean that there must be a working magnetic compass in the airplane, or a working heading indicator or both.

My first thought is that there must be at least a magnetic compass in the airplane.
Any thoughts on how to interpret this?

Requirement - magnetic direction indicator

Instrument - magnetic compass - what is its source of directional alignment?
Instrument - directional gyro - what is its source of directional alignment?

Obviously one is magnetic and one is vaccuum driven. Does this make the answer more clear to you?

[Benji86]

Yes, thank you for your reply
That was my initial train of thought, but as things sometimes happen, I questioned myself on this reasoning! Ok I have another one for you,
For 91.211 for pressurized oxygen requirements, it says that below FL410 two pilots at the controls must have the quick donning oxygen masks, does this mean that part of the requirement is that there MUST be 2 pilots at the controls below FL410?

[mojo6911]

Originally Posted by Benji86

Yes, thank you for your reply
That was my initial train of thought, but as things sometimes happen, I questioned myself on this reasoning! Ok I have another one for you,
For 91.211 for pressurized oxygen requirements, it says that below FL410 two pilots at the controls must have the quick donning oxygen masks, does this mean that part of the requirement is that there MUST be 2 pilots at the controls below FL410?

(ii) At flight altitudes above flight level 350 unless one pilot at the controls of the airplane is wearing and using an oxygen mask that is secured and sealed and that either supplies oxygen at all times or automatically supplies oxygen whenever the cabin pressure altitude of the airplane exceeds 14,000 feet (MSL), except that the one pilot need not wear and use an oxygen mask while at or below flight level 410 if there are two pilots at the controls and each pilot has a quick-donning type of oxygen mask that can be placed on the face with one hand from the ready position within 5 seconds, supplying oxygen and properly secured and sealed.

I read that as a single pilot operation, you need to comply with the bolded part, but I may be wrong.

[nosehair]

Originally Posted by Benji86

concerning the requirement for having a magnetic direction indicator in the aircraft.

It used to say "magnetic compass" until the new line of aircraft that have Electronic magnetic direction indicators caused a change in wording.

[Blackhawk]

I really hope we're not getting wrapped up in 91.205 as the begining and end to determining aircraft airworthiness again.

[Roger, Roger]

Originally Posted by Blackhawk

I really hope we're not getting wrapped up in 91.205 as the begining and end to determining aircraft airworthiness again.

We've been down this road.

All's I can say is...

...91.213.

[nosehair]

Originally Posted by Roger, Roger

All's I can say is...

...91.213.

(d). ...91.213(d) Emphasize the (d). Don't even start reading (a),(b), & (c). They apply to operations with an approved "equipment list". (d) applies to all other operations that don't have an equipment list - which is most all of part 91 operations.

[MidlifeFlyer]

Originally Posted by nosehair

(d). ...91.213(d) Emphasize the (d). Don't even start reading (a),(b), & (c). They apply to operations with an approved "equipment list". (d) applies to all other operations that don't have an equipment list - which is most all of part 91 operations.

Don't say "equipment list" in that post. Say "Minimum Equipment List."

Just about every light airplane with a modern POH has an "equipment list" in the weight and balance section of the POH. Section 5 - "Weight & Balance/Equipment List."

The confusion comes in when pilots think this is the MEL that 91.213 (a)(b) and (c) are talking about.

[nosehair]

Originally Posted by MidlifeFlyer

Don't say "equipment list" in that post. Say "Minimum Equipment List."

RightRightRight, I skimmed over that one too, thanks Mark.