Q400 NNBM Limitations

Question 1

Oil: (nnbm)

Answer 1

MIL-L-7808; MIL-L-23699C; or Castrol 98UK; Mobile Jet II. Do not mix oils.

Question 2

Engine Rating Limitations
The pilot should set the torque to the target bug to obtain the required rating. (nnmb)
– This target-bug rating should not be exceeded deliberately except

Answer 2

in an emergency

Question 3

Maximum Take-Off (MTOP) (5071 SHP)

– This is the maximum power on the operating engine certified and is time limited to (nnbm)

Answer 3

106% TRQ

5 minutes

Question 4

Normal Take-Off (NTOP) (4580 SHP) (nnbm)

Answer 4

90.3% TRQ. – This is the take-off power developed under normal take-off conditions.

Question 5

Maximum Continuous (MCP) (nnbm)

Answer 5

100% TRQ – The maximum continuous power rating is the maximum power certified for
continuous use. This rating should only be used when required to ensure safe flight
(i.e. engine failure).

Question 6

Variation of ITT with ambient air temp for NTOP: (nnbm)
OAT °C ITT NTOP °C
- 40 823
- 16 824
- 10 828
0 832
+ 10 838
+ 20 840
+ 30 844
+ 33 and above 845

Answer 6

Var of NH and NL w/amb air temp for NTOP
(nnbm)
OAT°C NL % NTOP NH % NTOP
- 50 95.40 97.60
- 40 95.60 97.63
- 30 95.80 97.66
- 20 95.95 97.70
- 10 96.45 97.80
0 97.05 98.00
+ 10 97.50 98.18
+ 20 97.80 98.32
+ 30 98.20 98.50
+ 40 98.25 98.70
+ 50 98.28 98.85

Question 7

Torque Indicators (nnbm)
Over-Limit (red pointer/digits) 
Maximum – (red radial) 
Caution (yellow arc) 
Normal operating (green arc)

Answer 7

Above 106%
106%
100 to 106%
0 to 100%

Question 8

Turbine Temperature Indicators (ITT) (nnbm)
Over-limit (red pointer/digits) 
Maximum – starting (red radial) 
Maximum – (red radial)
Normal operating

Answer 8

• above maximum (red radial) above 920°C transient (start only)
• 920°C
• 880°C (MTOP and MCP rating)
• 250° to 880° (MTOP and MCP rating)

Question 9

Propeller RPM Indicators (NP) (nnbm)
Over-limit (red pointer/digits)
Maximum (red radial)
Caution (yellow arc)
Normal operating (green arc)

Answer 9

above 1071 rpm
1071 rpm
1020 to 1071 rpm
660 to 1020 rpm

Question 10

Gas Generator (High Pressure) Rotor Speed Indicator (NH) (nnbm)
Over-limit (red pointer/digits)
Maximum (red radial)
Normal Operating (green arc)

Answer 10

above Maximum (red radial)
100% (MTOP and MCP rating)
64.2% to 100% (MTOP and MCP rating)

Question 11

Gas Generator (Low Pressure) Rotor Speed Indicator (NL) (nnbm)
Over limit (red digits)
Normal operating (white digits)

Answer 11

above 100% (MTOP and MCP rating)

0 to 100% (MTOP and MCP rating)

Question 12

Oil Temperature Indicator (nnbm)
Over limit (red pointer/digits)
Maximum (red radial)

Answer 12

above Maximum (red radial), below – 40°C
107°C, -40°C except as specified below:
125°C, -40°C with POWER levers between
DISC and FLIGHT IDLE

Question 13

Oil Temperature Indicator (nnbm)

Caution (yellow arc)

Answer 13

107° to 125° C for conditions where red
radial is at 125°C
In air -40° to 0°C with PROP selector OFF -40° to 65°C with PROP selector TEST or ON
On ground -40° to 55°C changing to 65°C
three minutes after take-off with PROP
selector on.

Question 14

Oil Temperature Indicator (nnbm)
Normal Operating (green arc)

Answer 14

0° to 107°C with PROP selector OFF

65° to 107°C with PROP selector TEST or ON

Question 15

Oil Pressure Indicator (nnbm)
Under-limit (red pointer/digits) 
Minimum (red radial) 
Caution (yellow arc)
Normal operating (green arc)

Answer 15

-below 44 psi
-44 psi
-44 to 61 psi and 72 to 100 psi
Low pressure warning light 44 to 50 psi
61 to 72 psi

Question 16

Fuel Temperature Indicator (nnbm)
Over-limit (red digits)
Caution (yellow digits)
Normal operation (white digits)

Answer 16

above 71°C
below 0°C
0° to 71°C

Question 17

Permitted Fuel Grades (nnbm)

Canada Kerosene Type

Answer 17

CAN 2-3.23-M81 NATO F37

WARNING The use of WIDE CUT TYPE FUELS is prohibited.

Question 18

Permitted Fuel Grades (nnbm)

US Kerosene Type

Answer 18

ASTM D 1655 JET A
ASTM D 1655 JET A1
MIL-T-5624 JP-5
MIL-T-5624 JP-8
MIL - DTL 83133 JP8 + 100
Fuels conforming to any of the above specifications are approved for use. Mixing of fuels is permitted.
NOTE: When using NATO F37 (JP8+100) fuel, contact Maintenance Control prior to use

Question 19

Fuel Additives (nnbm)
The following fuel system ice inhibitors are approved for use with approved fuels:
FUEL SYSTEM ICE INHIBITOR
CANADIAN and U.S

Answer 19

MIL-I-27686 MIL-DTL-85470

Maximum concentration of 0.15% by volume

Question 20

Flight Management System (FMS) (nnbm)
1. Approach Navigation is prohibited with the FMS Data Base expired. IFR enroute and terminal navigation is prohibited with the FMS Data Base expired unless the Pilot verifies the waypoints for accuracy by reference to current publications.
2. When using previously stored flight plans and waypoints, the way-points must be
verified for accuracy, by reference to current publication, prior to their use.
3. The aircraft must have approved navigation equipment appropriate to the route of
flight installed and operating so as to provide an alternate means of navigation.

Answer 20

Flight Management System (FMS) (nnbm)
4. Flight above 73° north latitude or below 60° south latitude using the FMS may be
conducted only when magnetic variation is input manually into the system or an
alternate true heading source is used and no manual variation has been input.
5. Fuel display parameter is advisory only and must not be used as the primary means for computing fuel load and range.
6. The FMS may only be used for navigation guidance if the reference coordinated data system for the intended route is referenced to in WGS-84 or NAD-83.

Question 21

Flight Management System (FMS) (nnbm)

7. Instrument approaches must be conducted in the approach mode and for GPS approaches, RAIM must be available at the final approach fix.
8. Instrument approaches must be accomplished in accordance with instrument approach procedures that are retrieved from the FMS database.
9. On RNAV approaches where vertical guidance (VNAV Mode) is used, the Company must bug MDA plus fifty (50) feet. This is referred to as a Derived Descent Altitude (DDA) and allows for dip during a missed approach without descending below the charted LNAV MDA (R).

Answer 21

Flight Management System (FMS) (nnbm)
10.Navigation by means of Pilot-defined, non published approaches under instrument
meteorological conditions is prohibited.
11.P-RNAV operations may only be conducted with the FMS in terminal mode.
12.When altitudes are manually entered before or after the temperature compensation function is activated, it may produce VNAV paths with climb segments, and result in a VNAV disconnect.

Question 22

UNS-1E (nnbm)
1. The UNS-1E is approved for VFR/IFR enroute, terminal, and approach LNAV and
VNAV operations.
2. Whenever navigation is predicated on the FMS, the Operator’s Manual, Report No.
2423sv801 (or equivalent at current revision) must be available to the Flight Crew.
3. FMS based ILS and MLS approaches are prohibited.

Answer 22

UNS-1E (nnbm)
4. VNAV vertical path angles greater than 6° in enroute and terminal mode and
greater than 4° in approach mode are prohibited.
5. SCN 802.2, SCN 802.8: Manually entered altitudes will not have an altitude
correction applied when temperature compensation function is activated. All
manually entered altitudes must be adjusted with the appropriate temperature
correction before they are entered into the FMS, even if the temperature
compensation function is not active.