Associated EFIS/MFD FAN FAIL annunciators are operative.
Reach up behind the instrument panel and verify the EFIS instrument blower/s and/or the MFD blower is forcing air out its respective piccolo tube. Verify all of the following fans are operating:
DPU fan 2 ea
MPU fan 1 ea
EFIS fan 2 ea
MFD fan 1 ea.
Verify that associated EFIS/ MFD FAN FAIL Annunciators are operative.
C
-
-
(O) One may be inoperative provided:
Nose Cooling Fan and Fan Door are verified operative,
Confirm EFIS/MFD Overheat annunciators’ operation, and
Limit use of EFIS/MFD ground use to 30 minutes before takeoff and after landing.
C
-
0
(M) May be inoperative provided:
All EFIS/MFD cooling fans are verified operative before each departure,
Associated EFIS/MFD OVHT Annunciators are operative, and
Ground use of EFIS is limited to not more than 30 minutes.
Reach up behind the instrument panel and verify EFIS instrument blower/s and/ or the MFD blower is forcing air out its respective piccolo tube. Assure all of the following fans are operative:
DPU fan 2 ea
MPU fan 1 ea
EFIS fan 2 ea
MFD fan 1 ea.
Verify associated EFIS/MFD OVHT Annunciators are operative.
Inoperative display is positioned in the Right Side EHSI location,
RMI/BDI’s) is/are operative, and
Standby Instrument(s) are operative.
Confirm an EADI is available on the RH side. Two EFD’s will display on the LH side. The captain will determine if this is a safe configuration for the flight.
2)
Collins Pro Line 21 Equipped Aircraft
B
4
3
Right side MFD position may be inoperative.
Note
With IFIS-5000 AFD installed, the EFB is affected (Refer to Chapter 46).
70-5
EFIS Symbol Generator Units (SGU, MSG, DPU, and/or MPU)
B
3
2
(O) One may be inoperative provided:
The No. 1 (left side) SGU/ DPU remains operative, and
Each pilot’s EFIS is driven be an operative independent symbol generator unit (SGU, MSG, DPU, or MPU).
Confirm each pilots’ EFIS is driven by an independent SGU, MSG, DPU, or MPU which is operative. Refer to the applicable Avionics Operating Manual for guidance.
