 |
|||
|
|
|||
| ||||||||||
|
|  MILT81821
3 . 2 . 1 . 5 . 3 Dual maintenance level electronics trainers. Trainers providing both
organizational, intermediate and direct/general level maintenance training capability On a single
trainer shall be designed to comply primarily with the requirements of intermediate and
direct/general level electronics maintenance trainers specified herein, and shall provide the
maximum feasible additional capability for organizational level maintenance training.
Items such as pumps, motors, and frequency converters shall be
3.2.1.6 Noise level.
shock-mounted to minimize vibration and noise level. If the combined noise level, when measured
at a horizontal distance of 10 feet from the trainer in any direction exceeds the noise level limits
specified in Table 1, the items involved shall be grouped together on a mobile platform which may
be readily removed from the trainer and placed outside the classroom, or soundproofing shall be
provided as part of the trainer (soundproofing is preferred). It shall be possible to operate such
items while they are installed on, or remotely located and interconnected to, the trainer panel.
Noise Level Limits
TABLE I,
Noise Level (db)
Frequency (Octave) Band
Center Frequency (Hz)
71
63
125
65
250
59
54
500
1,000
52
50
2,000
49
4,000
48
8,000
The trainer availability factor for scheduled operation in the training
3.2.1.7 Availability.
environment shall be a minimum of nine- tenths (0.9) based on the following formula:
A = Availability
MTBF
A=
MTBF = Mean time between failure (see 3.2.3)
MTBF+MTTR
MTTR = Mean time to repair (see 3.2.4)
13
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals