OMC RIM

Question 1

OMC Section 9 : Hot and High
Density Alt (DA) Calculations…

Answer 1

D/A = A/Field Press Alt x 1000’ per 8℃ > ISA

Jo’burg elev = 5500’ OAT 32℃
ISA is 4℃ [-2℃ per 1000’ = 15-11℃] ie. 4℃

Temp is 32 - 4 = 28℃ above ISA
28/8 = 3.5
DA = 5500’ + (3.5 x 1000) = 9000’

Altimeter UNDER-READS and GrndSpd is higher for given IAS

Question 2

OMC Section 9 : Cold Error correction

Use the calculator, but why is dangerous and how is it worked out?

Answer 2

4% over-read height per 10℃ below ISA

CYYZ OAT -10℃

ISA 15℃ so temp is 25℃ below ISA
25/10 = 2.5, 4% x 2.5 = 10%

Altimeter over-reading by 10%
MDA is 500’ - corrected = 550’

Altimeter OVER-READS - DANGEROUS
eg. position check 2500’ RA = 2750’ baro

Question 3

OMC 2.2.1 EAT EXCEEDING FUEL CAPABILITY

how do we avoid diverting….

Answer 3

Up to 45 mins prior TOD

Contact FTD - ask them to negotiate improvement with ATC

Entering Hold - advise max hold time and improvement sort via company

Question 4

OMC 2.2.2 TEAM APPROACHES LHR

Used to reduce congestion, but how…

Answer 4

27L G/S turned off

LOC/RNAV APP

WX - 1000’ Ceiling ≧6km
PAPIS serviceable

Only offered in the hold

Question 5

OMC 2.2.4 RECAT WAKE VORTEX LHR

Heavy behind SUPER, T/O and Landing

Answer 5

100 seconds on T/O

5 nm on Approach (LIDO)

Question 6

OMC 2.2.5

2.5 nm spacing on final weather required

Answer 6

Day, DRY runway
≧ 10km
Ceiling 1500’
HW ≧10 kts
No windshear forecast