DA20-C1 Flight Manual
Normal Operating Procedures
Doc # DA202-C1 April 16, 2009 Page 4 - 3
4.3. STRUCTURAL TEMPERATURE INDICATOR
A structural temperature indicator, installed on the spar bridge, indicates when the structural
temperature limitation is exceeded (refer to Section 2.17). The indicator need only be checked
if the OAT exceeds 38º C (100º F).
The indicator is accessed by lifting the flap between the two seat-back cushions. The indicator
is visible through the cut out in the seat shell backs (see Figure 2).
At temperatures below the 55º C (131º F) limit, the indicator appears all red with a faint
indication of “55” (º C). At temperatures exceeding the 55º C (131º F) limit, the indicator
displays a clearly contrasting red “55” (º C) on a black background (see Figure 1).
NOTE
At temperatures approaching the limit, the background will
progressively darken prior to turning black; this indicates
acceptable temperatures.
NOTE
Aircraft with other than white undersides have an additional
structural temperature indicator installed adjacent to the fuel
drains.
Red “55” on black background
indicates that structural temperature
limit is exceeded. Flight is prohibited.
All red indicates that structural
temperature is below limit. Flight is
permitted.
Figure 1
Figure 2
Revision 24 DOT Approved
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